Dumb
1. lacking the power of speech (often offensive when applied to humans): a dumb animal.
2. temporarily unable to speak: dumb with astonishment.
3. refraining from any or much speech; silent.
4. made, done, etc., without speech.
5. lacking some usual property, characteristic, etc.
6. performed in pantomime; mimed.
7. Computers. pertaining to the inability to do processing locally: A dumb terminal can input, output, and display data, but cannot process it. Compare intelligent (def. 4).
8. Nautical. a. (of a barge) without means of propulsion.
b. (of any craft) without means of propulsion, steering, or signaling.