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"atypical" is also used as a crossword clue. If that's what you saw, the answer is often abnormal (8 letters).
Definitions
deviating from normal expectations; somewhat odd, strange, or abnormal
Word origin
From a- + typical.
Used in a sentence
“The condition also has an associated atypical development of the retina and optic nerve misrouting, resulting in significant vision issues.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Not typical”8 letters
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