obtuse vs dumb

obtuse and dumb both are adjectives.

Word	Noun	Adjective	Verb	Adverb
obtuse	No	Yes	No	No
dumb	No	Yes	No	No

As adjectives, obtuse and dumb are synonyms defined as:

obtuse and dumb: slow to learn or understand; lacking intellectual acuity

Other synonyms of obtuse include dense, dim, dull, slow.

obtuse (adjective)	dumb (adjective)
of an angle; between 90 and 180 degrees	slow to learn or understand; lacking intellectual acuity
(of a leaf shape) rounded at the apex	unable to speak because of hereditary deafness
slow to learn or understand; lacking intellectual acuity	temporarily incapable of speaking
lacking in insight or discernment	lacking the power of human speech