uncharacteristic

Not like them

Uncharacteristic describes behavior or qualities that don't fit someone's usual pattern: It was uncharacteristic of her to be late.

The word implies surprise—you notice precisely because it deviates from expectation.

Something uncharacteristic of a place or thing similarly contradicts its typical nature: an uncharacteristically warm December day.

atypical

unusual

Not often encountered

irregular · uncommon · untypical · peculiar · singular · rare · odd · strange · deviant · divergent

unexpected

surprising

Causing mild shock

startling · astonishing · shocking · sudden · jarring · disconcerting · unprecedented · unlooked-for · blindsiding · disarming

incongruous

mismatched

Not fitting together properly

contradictory · inharmonious · discrepant · dissonant · clashing · at-odds · out-of-place · unfitting · unsuitable · improper

Opposites
typicality

uncharacteristiccharacteristic

Distinguishing quality or trait

typical · usual · normal · customary · habitual

distinctiveness

uncharacteristicdistinctive

Readily identifiable, set apart

diagnostic · symptomatic · peculiar · signature · quintessential

Phrases
Family

uncharacteristically

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G