What is the meaning of Dumb?

Unable to speak; lacking power of speech (kept in "deaf, dumb, and blind").

Not talkative; taciturn or unwilling to speak.

Having no input or voice in running things.

Unaccompanied by words or speech, silent, wordless.

Not producing any sound, silent.

Stupid.

Pointless, foolish, lacking intellectual content or value.

Lacking some functionality or property ordinarily characteristic of its kind.

Not equipped with intelligent behavior or processing capabilities of its own.

Lacking brightness or clearness as a colour; dim, dull.

To silence.

To make stupid.

To represent as stupid.

To reduce the intellectual demands of.

Very, extremely.

An intensifier expressing contempt; damn, damned.

Lacking or failing to display the faculty of voice:

  1. Unspeaking; unable to speak or having muteness.
  2. A mute; one who can't speak.
  3. Temporarily unable to speak due to strong emotions.
  4. Unwilling or reluctant to speak; not speaking.

Unspeaking; unable to speak or having muteness.

A mute; one who can't speak.

Temporarily unable to speak due to strong emotions.

Unwilling or reluctant to speak; not speaking.

Powerless, ineffectual (either inherently or due to events)

Unknowledgeable; having no understanding or sense.

Unwilling or unable to make a noise; quiet or silent.

Unrevealing, useless; having no important messages or lessons.

Having nothing to keep one busy or engaged.

Refusing to preach or evangelise.

Refusing to be conceited or vainglorious.

mute, dumb (unable to speak)

a mute

Source: wiktionary.org