From Middle French obtus ("obtuse (geometry); narrow-minded, obtuse; boring, dull, lifeless"), from Latin obtūsus ("blunt, dull; obtuse"), past tense participle of obtundere, from obtundō, from ob- (see ob-) + tundō (ultimately from Proto-Indo-European *(s)tewd-, from *(s)tew-). More at obtund.
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