Similar word to tightlipped:

aloof, antisocial, brooding, clammed up, close, close-mouthed, cold, curt, distant, dour, dried-up, dumb, incommunicable, incommunicative, laconic, mum, mute, quiet, reserved, reticent, sententious, silent, sparing, speechless, tight-lipped, uncommunicable, uncommunicative, unexpressive, unforthcoming, withdrawn


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