When something is uncharacteristic, it's not typical or expected. Snow in South Carolina is uncharacteristic, even in January.

Your uncharacteristic silence might prompt your friends to worry about you, especially if you're normally the most talkative one in the room. On the other hand, an uncharacteristic win for your school's football team may fill you with uncharacteristic school spirit. Characteristic means "typical of a person or thing," and when you add the prefix un-, "not," you get its direct opposite.

Definitions of uncharacteristic
  1. adjective
    distinctive and not typical
    “a book uncharacteristic of its author”
    atypical, untypical
    not representative of a group, class, or type
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    typical or distinctive
    diagnostic, symptomatic
    characteristic or indicative of a disease
    distinctive, typical
    of a feature that helps to distinguish a person or thing
    characteristic of one only; distinctive or special
    exhibiting the qualities or characteristics that identify a group or kind or category
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