Taciturn

a.

1.

Habitually silent; not given to converse; not apt to talk or speak.

Adj.

1.

taciturn - habitually reserved and uncommunicative Antonyms: voluble - marked by a ready flow of speech; "she is an extremely voluble young woman who engages in soliloquies not conversations"

Spartan, abbreviated, abridged, aposiopestic, brief, brooding, brusque, clipped, close, close-lipped, close-tongued, closemouthed, compact, compendious, compressed, concise, condensed, contracted, crisp, curt, cut, docked, dour, dumb, economical of words, elliptic, epigrammatic, gnomic, indisposed to talk, laconic, mum, mute, pithy, pointed, pruned, reticent, sententious, short, short and sweet, shortened, silent, snug, sparing of words, speechless, succinct, summary, synopsized, terse, tight, tight-lipped, to the point, tongue-tied, truncated, uncommunicative, unexpressive, unloquacious, untalkative, word-bound, wordless