Use the adjective aberrant to describe unusual conduct. Sitting in a bathtub and singing show tunes all day long might be considered aberrant behavior.

For conduct that departs from the norm, aberrant is at hand to describe it if you want to set a formal, or even scientific tone to the discussion. You can put the accent on either the first syllable (AB-er-ent) or the second (uh-BER-ent); both pronunciations are acceptable. The Latin root aberrare means "to go astray," from the prefix ab- "off, away" plus errare "to wander." Other descendants of errare in English, like error and errant, have that double -r- and also refer to something that's either not wanted or not expected.

Definitions of aberrant
  1. adjective
    markedly different from an accepted norm
    aberrant behavior”
    synonyms: deviant, deviate
    abnormal, unnatural
    not normal; not typical or usual or regular or conforming to a norm
  2. noun
    one whose behavior departs substantially from the norm of a group
    see moresee less
    type of:
    anomaly, unusual person
    a person who is unusual
Commonly confused words

abhorrent / aberrant

Abhorrent describes something truly horrible like finding a dead rat in your soup, but something aberrant is just abnormal, like a cat in a pink fedora.

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