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English definition of “obtuse”

obtuse

adjective uk   /əbˈtjuːs/ us    /ɑːbˈtuːs/

obtuse adjective (ANGLE)

specialized mathematics (of an angle) more than 90° and less than 180° Describing angles, lines and orientations

obtuse adjective (STUPID)

formal stupid and slow to understand, or unwilling to try to understand: Surely the answer's obvious - or are you being deliberately obtuse?Stupid and sillyOf unsound mind
obtusely
adverb uk   /-li/ formal us  
obtuseness
noun [U] uk   /-nəs/ formal us  
(Definition of obtuse from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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