'Madman' in the Bible

And Achish saith unto his servants, 'Lo, ye see a man acting as a madman; why do ye bring him in unto me?

A lack of madmen have I, that ye have brought in this one to act as a madman by me! doth this one come in unto my house?'

And Jehu hath gone out unto the servants of his lord, and one saith to him, 'Is there peace? wherefore came this madman unto thee?' and he saith unto them, 'Ye have known the man and his talk.'