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Definition of atypical : That has no type; devoid of typical character; irregular; unlike the type.

Synonyms:

temporary, usual, uncharacteristic of, offbeat, unwonted, maverick, unorthodox, good, unnatural, unordinary, atypic, unrepresentative, preternatural, unpredictable, uncharacteristic, anomalistic

freakish, quirky, deranged, idiosyncratic, uncustomary, crazy, unusual, divergent, incongruous, inconsistent, unconventional, funny, aberrant, un-ordinary, odd, eccentric, off, curious, crosspatch, misfit, different, outlandish, bizarre, oddball, singular, novel, fey, uncommon, deviant, oddity, queer, incompatible, anomalous, improper, mismatch, strange, erratic, nonconforming, out of the ordinary, untypical, exceptional, unique, extraordinary, abnormal, peculiar, irregular, unfamiliar

rare

Usage examples:

• Opinion, however, is still unsettled as to the significance of the more atypical, oblique divisions of the parietal, particularly of those where the separation is limited to one angle. - "A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal Bulletin of the AMNH, Vol. XIII, Article XXI, pp. 281-295, Dec. 31, 1900", Ales Hrdlicka.
• The six specimens from two localities in Colorado available to Cockrum and Fitch exhibited evidence of intergradation at one locality, and atypical smallness at the other locality. - "Mammals of the Grand Mesa, Colorado", Sydney Anderson.
• One of the main preoccupations in the wards was the differential diagnosis between atypical malaria and typhoid fever, for the malaria that one reads of in textbooks did not exist save exceptionally. - "In Mesopotamia", Martin Swayne.