I just got out of a long debate over the meaning of dumb.
1) Is 'dumb' insulting: at all or in context?
2) Does it mean a person doesn't know something, but could learn it, OR that they can't learn something (or maybe just really unlikely to learn it)
The 2 native speakers of English disagreed on both questions
My friend and I said it can be offensive if he were to call a student dumb. He disagreed as he believes dumb is the same as 'uneducated (on a topic)'.