dumb

1a : lacking intelligence : stupid pretended to be dumb

b : showing a lack of intelligence asking dumb questions a dumb look on his face

c : requiring no intelligence dumb luck

2a : lacking the human power of speech dumb animals

b of a person, now often offensive : lacking the ability to speak

3 : temporarily unable to speak (as from shock or astonishment) struck dumb with fear

4 : not expressed in uttered words dumb grief

5 : silent they were capable of sitting for hours, dumb and unabashed, over their pipes— Ellen Glasgow also : taciturn

6 : lacking some usual attribute or accompaniment especially : having no means of self-propulsion a dumb barge

7 : not having the capability to process data a dumb terminal — compare intelligent sense 3a

Definition of dumb