Of persons: Secret in purpose or action; reserved, close; hence, underhand, sly, crafty. Obsolete.

Of persons: Not open, close, secretive; sly, deceitful. Obsolete.

Of a person: Reserved or reticent in conduct or conversation; close, discreet.

Of a person: †Reserved or reticent in conduct or conversation (obsolete); not given to indiscreet talking or the revelation of secrets; silent as…

colloquial. Strictly silent; mute; not saying a word. Esp. in to keep (also †play) mum: to remain silent, esp. so as not to reveal a secret…

Practising secrecy; reserved, reticent, uncommunicative; not open.

Keeping silence in relation to something; saying nothing about the matter.

as silent as the grave and variants: refraining from or not making any sound; (of a person) discreet, secretive; (of a place) hushed, completely…

Of a person: secretive, reticent; discreet, dependable in confidential matters. Obsolete.

Of a person: secretive; inclined to conceal feelings or intentions; silent or reticent about a particular thing; not open. to keep dark about (somet…

(un-, prefix1 affix 4.)

Of persons: Miserly, stingy; reserved, uncommunicative. (Cf. A. 4) Obsolete.

(un-, prefix1 affix 1.)

(un-, prefix1 affix 1.)

Of persons, their feelings, habits, etc.: Addicted or inclined to secrecy; reticent; not frank or open.

Having the lips firmly closed, esp. as a sign of determined suppression of emotion; also transferred and figurative. Also, determinedly reticent or…

Not forthcoming, reticent, wary, non-committal.

having the lips tightly closed, esp. as a sign of suppressed emotion or determined reticence; (chiefly figurative) uncommunicative, determinedly…

Secret, covert; esp. not open about something concerning oneself which, if revealed, could cause problems or embarrassment. Sometimes ironic, with…

Not demonstrative; shyly reserved or retiring. Unwilling to commit oneself (about a matter); archly reticent or evasive.

Of such close texture or construction as to be impervious to a fluid, etc. transferred and figurative leading to 3. Uncommunicative; secret; spec. Oi…