Dumb
Part of speech: adjective
Definition: Unable to speak; lacking power of speech. Of or pertaining to something, especially a person, that is extremely stupid. Pointless, foolish, lacking intellectual content or value.
Part of speech: verb
Definition: To silence. To make stupid. To represent as stupid. To reduce the intellectual demands of.
Example sentence: I'm stupid, I'm ugly, I'm dumb, I smell. Did I mention I'm stupid?
Inarticulate
Part of speech: adjective
Definition: not articulated in normal wordsspeechlessunable to speak with any claritynot having joints or other articulations