unexpected behavior JUST WRITTEN FOR YOU

/ʌnˈɛksˌpɛktɪd bɪˈheɪvjər/ · un.ex.pect.ed be.ha.vior

noun

an action or reaction that is not anticipated or predicted The software exhibited unexpected behavior when the user clicked the button multiple times in rapid succession.
a manner of acting or conducting oneself that is surprising or unconventional The artist's unexpected behavior during the interview, such as wearing a costume and using a fake accent, generated a lot of buzz on social media.

Synonyms

unpredictable behavior unforeseen action surprising conduct unanticipated reaction abnormal behavior irregular conduct anomalous action unusual reaction

Antonyms

expected behavior predictable action normal conduct conventional reaction typical behavior ordinary behavior

Did you know? The concept of unexpected behavior is often studied in fields such as psychology, sociology, and computer science, where understanding and predicting human or system behavior is crucial. The phrase has also been used in popular culture, such as in the title of a 2018 album by the American rock band, 'Unexpected Behavior'.

Related terms

anomaly abnormality irregularity unpredictability surprise shock

Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 29, 2026