Synonyms of obtuse

1 Syllable
crass, blunt, thick, dumb, dull
2 Syllables
blunting, duller, dense, blunter, stupid, doltish, dopey, dullest, crasser, nescient, bluntest, toothless, mindless, stolid, crassest
3 Syllables
unstudious, stupidest, thickskulled, dimwitted, hardened, ignorant, blockheaded, feelingless, coldhearted, edgeless, nitwitted, hardboiled, fatheaded, unpointed, opaque, thick-headed
4 Syllables
boneheaded, lamebrained, loggerheaded, unsharpened, unscholarly, uninstructed
5 Syllables
insusceptible, unintelligent, insensitive, unknowledgeable, imperceptive, uncomprehending, edentulate, unintellectual, unreflective
6 Syllables
amphibological