atypical

1 being out of the ordinary the postal service delivered the package with atypical speed Synonyms aberrant, aberrated, abnormal, anomalous, exceptional, especial, exceeding, extraordinaire, extraordinary, freak, odd, peculiar, phenomenal, preternatural, rare, singular, uncommon, uncustomary, unique, unusual, unwontedRelated Words conspicuous, notable, noticeable, outstanding, prominent, remarkable, salient, striking; bizarre, deviant, eccentric, freakish, monstrous, oddball, outlandish, quaint, strange, weird; incomprehensible, inconceivable, incredible, unimaginable, unthinkableNear Antonyms everyday, familiar, frequentAntonyms common, customary, normal, ordinary, typical, unexceptional, unextraordinary, usual

2 departing from some accepted standard of what is normal since that's an atypical response for an infant, you might want to have her hearing tested Synonyms aberrant, aberrational, abnormal, anomalous, deviant, deviate, devious, irregular, unnatural, untypicalRelated Words unrepresentative; extraordinary, preternatural; rare, uncommon, uncustomary, unusual, unwonted; bizarre, curious, far-out, funny, kinky, odd, outlandish, out-of-the-way, outré, peculiar, quaint, queer, queerish, quirky, remarkable, screwy, strange, wacky (also whacky), way-out, weird, wild; eccentric, freakish, idiosyncratic, nonconformist, unconventional, unorthodox; extraordinary, preternatural; rare, uncommon, uncustomary, unusual, unwonted; odd, peculiar, strangeNear Antonyms common, commonplace, everyday, familiar, ordinary, routine, run-of-the-mill, run-of-the-mine (or run-of-mine), unexceptional, unremarkable, workaday; customary, usual, wonted; archetypal (also archetypical), average, characteristic, representativeAntonyms natural, normal, regular, standard, typical