Pronunciation
BrE /æbˈnɔːml/
AmE /æbˈnɔːrml/
Part of Speech
Adjective
Frequency Level
B2
Register
Neutral–formal
Definition
Departing from what is typical, usual, expected, or considered standard in behavior, appearance, condition, or function.
Extended Meaning
In a broader sense, abnormal refers to anything that significantly deviates from an established norm—whether physical, psychological, social, scientific, or statistical. It can describe conditions, patterns, results, or behaviors that fall outside an accepted or healthy range. While technically neutral, the word often carries a clinical or evaluative tone, suggesting that something requires attention, analysis, or correction. In specialized fields, it signals irregularity relative to known benchmarks or standards.
Detailed Explanation
Abnormal is commonly used in medical, psychological, and scientific contexts to highlight irregularities that require further examination. In healthcare, it may refer to unusual test results, unexpected symptoms, or conditions outside normal physiological limits. In psychology, it describes behaviors or emotional responses that differ markedly from cultural expectations or statistical norms. The term itself does not specify whether the deviation is harmful, but in practice it often implies concern.
In everyday language, abnormal can describe anything that appears odd, unusual, or surprising. This includes events, reactions, patterns, or objects that do not follow expected rules. Because the word may carry a negative or stigmatizing connotation, careful use is important, especially when referring to people. In formal writing, more specific descriptors—such as irregular, atypical, or unusual—are sometimes preferred to avoid unintended judgment.
Semantic Field
abnormal vs. unusual — unusual is softer and less clinical.
abnormal vs. irregular — irregular refers to disrupted pattern; abnormal refers to deviation from a standard.
abnormal vs. atypical — atypical means not typical but not necessarily negative.
abnormal vs. defective — defective implies malfunction; abnormal means deviation.
abnormal vs. pathological — pathological implies disease; abnormal is broader.
Example Sentences
The doctor noted an abnormal increase in her heart rate.
His behavior seemed abnormal compared to usual patterns.
They detected an abnormal sound in the engine.
The test results showed several abnormal values.
Scientists observed abnormal weather conditions last month.
An abnormal amount of noise came from the basement.
The plant’s growth was abnormal for its environment.
He felt that the reaction was slightly abnormal.
Researchers investigated the abnormal fluctuations in data.
The light flickered in an abnormal rhythm.
Dialogues
“Are the results normal?”
“No, a few readings are abnormal.”
“Does this look abnormal to you?”
“Yes, it seems off.”
“Why is the temperature so high?”
“It’s abnormal for this season.”
“Did the mechanic find anything?”
“An abnormal vibration in the engine.”
“Is the behavior serious?”
“It’s abnormal but not dangerous.”
“Should I worry about this?”
“Only if the symptoms become abnormal.”
“What did the scan show?”
“An abnormal pattern on the left side.”
“Is this noise typical?”
“No, completely abnormal.”
“Did the experiment work?”
“No, the data looks abnormal.”
“Is that reaction expected?”
“Not really—it’s abnormal.”
Stories
- During her morning jog, Anna noticed an abnormal sound coming from her shoes. She stopped to check them but found nothing obvious. She jogged a little further, still hearing it. Curious, she walked back home slowly. Later, she discovered a small stone stuck inside the sole.
- Mark reviewed the monthly reports and spotted an abnormal spike in sales. He checked the numbers again to make sure it wasn’t a mistake. His coworker joined him to compare past months. They realized the spike came from a seasonal promotion. The discovery made the data make sense again.
- Lisa saw her cat behaving in an abnormal way one afternoon. It was pacing back and forth and refusing food. Concerned, she observed it for a few hours. When nothing changed, she called the vet. Thankfully, it turned out to be a minor issue.
- Evan noticed an abnormal shadow on the wall in his living room. It appeared only when the evening sun came through the window. He examined the area carefully and found a small decorative item creating the effect. Once he moved it, the shadow disappeared.
- At the office, the lights flickered in an abnormal pattern during a meeting. Everyone paused to look up. The maintenance team was called in to inspect the wiring. They fixed the issue within minutes. The meeting continued without further interruptions.
Common Collocations
abnormal behavior — behavior that deviates from expected norms.
Example: The therapist evaluated the child’s abnormal behavior.
abnormal results — test outcomes outside the normal range.
Example: The doctor discussed the abnormal results calmly.
abnormal growth — irregular development or expansion.
Example: The plant showed abnormal growth this season.
abnormal condition — a state that is not typical or healthy.
Example: The machine shut down due to an abnormal condition.
abnormal pattern — a sequence that differs from the usual.
Example: They detected an abnormal pattern in the data.
abnormal symptoms — unexpected signs of illness.
Example: She reported abnormal symptoms after the medication.
abnormal reading — measurement outside normal limits.
Example: The monitor displayed an abnormal reading.
abnormal levels — quantities higher or lower than expected.
Example: The lab found abnormal levels of iron.
abnormal response — reaction that differs from expected outcomes.
Example: The patient showed an abnormal response to treatment.
abnormal movement — motion that appears irregular or erratic.
Example: The camera recorded an abnormal movement in the gears.
Syntactic Patterns
be abnormal — The heartbeat is abnormal.
appear abnormal — The results appear abnormal.
seem abnormal — His reaction seemed abnormal.
consider something abnormal — They considered the noise abnormal.
abnormal for + context — It’s abnormal for temperatures to rise so quickly.
abnormal in + location — The growth was abnormal in the lower region.
detect/observe/find + abnormal + noun — They observed abnormal activity.
Colligation
Abnormal frequently appears with verbs of observation, measurement, or assessment, because it evaluates something against a standard. Common verbs include appear, seem, become, remain, and look, all of which highlight perception or change.
It also collocates naturally with passive structures: was considered abnormal, was found to be abnormal, as these express professional evaluation.
Prepositional patterns include abnormal for (comparison within a context: abnormal for his age), abnormal in (location or category: abnormal in size), and abnormal at (specific point: abnormal at high temperatures). These structures help link the deviation to conditions, standards, or environments.
Usage Notes
Although technically neutral, abnormal can sound clinical or judgmental when referring to people. In sensitive contexts, alternatives like atypical, unusual, or unexpected may be more appropriate. In medical and scientific writing, abnormal is standard terminology, but precision is important—what counts as “normal” varies across populations, environments, and systems. Learners should avoid using abnormal casually about individuals unless the context is strictly professional.
Cultural and Historical Notes
The word has long been associated with medical and psychological evaluation, dating back to early classifications of human behavior and health. Over centuries, societies have shifted from moral interpretations of “abnormality” toward scientific measurement and statistical norms. Modern discussions emphasize objectivity and sensitivity, especially regarding mental health, disability, and diversity.
Idioms and Fixed Expressions
abnormal return — unexpected financial performance.
abnormal psychology — the study of atypical mental behavior.
abnormal load — oversized cargo in transport regulations.
abnormal condition — warning indicator in technical systems.
abnormal event — irregular occurrence requiring review.
Pronunciation Notes
Learners often reduce the second syllable incorrectly; it must keep clear stress.
The /bˈnɔː/ cluster can be difficult—ensure smooth transition without adding extra vowels.
Avoid pronouncing it as “ab-nor-mal” with equal stress; the stress is on the second syllable.
The final /l/ should be light in BrE but clearer in AmE.
The initial /æ/ should not shift toward /ə/ in formal speech.
Typical Errors
Incorrect: This is very normal abnormal. → Correct: This is very abnormal.
Incorrect: He is abnormal person. → Correct: He is an abnormal person.
Incorrect: The test showed an abnormality result. → Correct: The test showed abnormal results.
Incorrect: This sound is abnormal for to hear. → Correct: This sound is abnormal to hear.
Incorrect: It’s abnormal than usual. → Correct: It’s more abnormal than usual.
Learner’s Checklist
Use abnormal to describe deviation from a standard.
Avoid using it casually about people.
Use abnormal for to compare within a context.
Use abnormal results/levels/symptoms in scientific settings.
Keep the stress on the second syllable.
Word Family
abnormal (adjective)
abnormally (adverb)
abnormality (noun)
normal (adjective)
normalize (verb)
Morphological Notes
Formed from the prefix ab- (“away from, not”) + normal (“standard, usual”).
The prefix signals deviation from an established norm.
Its noun form abnormality adds the suffix -ity to express a state or condition.
The adverb abnormally uses -ly for manner.
Mini Test
- Fill in: The doctor found ___ results in the scan.
- True/False: “Abnormal” is always negative.
- Correct the error: This behavior is abnormal for to see.
- Choose: The reaction seemed (normal / abnormal).
- Fill in: The noise was ___ for that type of machine.
Usage Scenarios
Describing medical test results.
Discussing scientific measurements.
Analyzing unusual behavior or patterns.
Identifying irregular technical performance.
Comparing values to expected standards.