Part of speech:
Inclined to keep one's thoughts, feelings, and personal affairs to oneself.
Tending to remain concealed. Used of animals.
Made, done, or situated so as to attract little notice:
Silent; not speaking
Disposed not to talk; tightlipped.
Mute is defined as silent or not capable of speaking.
Find another word for tight-lipped. In this page you can discover 15 synonyms, antonyms, idiomatic expressions, and related words for tight-lipped, like: taciturn, reticent, secretive, quiet, reserved, closemouthed, discreet, mum, silent, close-mouthed and mute.