Pronunciation (UK) IPA (key): /əbˈtjuːs/ or /-ˈtʃuːs/ (US) IPA (key): /əbˈt(j)us/ or /ɑb-/ Audio (US)(file) Audio (AU)(file) Hyphenation: ob‧tuse Adjective Positive obtuse Comparative obtuser Superlative obtusest Positive obtuse Comparative more obtuse Superlative most obtuse If an angle is acute, it is more than 90 degrees but less than 180 degrees in size. Antonym: acute Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads