dumb

unable to speak because of a strong emotion (e.g., with rage, with amazement)

very stupid

very stupid

extremely stupid

simply and completely stupid

quite stupid

unable to hear or speak. Note: This term is now considered old-fashioned and offensive by many people.

to be stupid

to sound stupid

to appear stupid

to feel as though one is stupid

to pretend to be stupid, often to avoid responsibility or trouble

to seem stupid

to behave as if one is stupid

to be so shocked or surprised that one cannot speak

to be unable to speak

to lose the ability to speak