(a.) Habitually silent; not given to converse; not apt to talk or speak\.

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 quiet reserved 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