Communicative : willing, eager, or able to talk or impart information.Primitive : relating to, denoting, or preserving the character of an early stage in the evolutionary or historical development of something.Passive : accepting or allowing what happens or what others do, without active response or resistance.Dumb : temporarily unable or unwilling to speak.Reticent : not revealing one's thoughts or feelings readily.Antonym of Communicative is Reticent