uncommunicative
Definitions
Unwilling to talk or impart information.
Not inclined to communicate or share thoughts and feelings.
Examples
He became notoriously uncommunicative after the argument, refusing to answer any of my questions.
The witness remained uncommunicative throughout the entire interrogation, staring blankly at the wall.
Synonyms
taciturn reserved reticent withdrawn secretive aloof laconic
Antonyms
communicative talkative garrulous loquacious outgoing chatty voluble