tight–mouthed

given to keeping one's activities hidden from public observation or knowledge the studio has been tight-mouthed about how the show's cliff-hanger season finale will be resolved Synonyms close, closemouthed, dark, reticent, tight-mouthed, uncommunicativeRelated Words quiet, reserved, silent, taciturn, tight-lipped; discreet, prudent; clandestine, covert, furtive, hugger-mugger, secret, sneak, sneaky, stealthy, surreptitious, undercover, underhand, underhandedNear Antonyms candid, frank, honest, out-front, up-front; blunt, outspoken, tactlessAntonyms communicative, open