'Dumb' in the Bible

And they were beyond measure astonished, saying, He hath done all things well; he maketh even the deaf to hear, and the dumb to speak.

And one of the multitude answered him, Teacher, I brought unto thee my son, who hath a dumb spirit;

And when Jesus saw that a multitude came running together, he rebuked the unclean spirit, saying unto him, Thou dumb and deaf spirit, I command thee, come out of him, and enter no more into him.