Closemouthed \Close"mouthed`\, a. Cautious in speaking; secret; wary; uncommunicative. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

36 Moby Thesaurus words for "closemouthed": brief, brusque, close, close-lipped, close-tongued, concise, curt, dark, discreet, dumb, economical of words, evasive, indisposed to talk, laconic, mum, mute, quiet, reserved, reticent, secret, secretive, shifty, short, silent, snug, sparing of words, speechless, taciturn, terse, tight-lipped, tongue-tied, uncommunicative, unloquacious, untalkative, word-bound, wordless

Source: Moby Thesaurus II by Grady Ward, 1.0
 

closemouthed adj : inclined to secrecy or reticence about divulging information; "although they knew her whereabouts her friends kept close about it" [syn: close, closelipped, secretive, tightlipped]

Source: WordNet (r) 2.0
 

Closemouthed \Close"mouthed`\, a. Cautious in speaking; secret; wary; uncommunicative.

Source: Webster's Revised Unabridged Dictionary (1913)