FreeVocabulary
Obtuse
/əbˈtuːs/ adjective mediumSlow to understand or notice something obvious; mentally dull.
He seemed strangely obtuse about why his constant jokes were upsetting his coworkers.
Memory Trick
In geometry, an 'obtuse angle' is wide and blunt rather than sharp — an obtuse mind is similarly blunt, missing the sharp point of things.