Synonyms and related words :
anaudic, aphasic, aphonic, breathless, brief, brusque, close, close-tongued, closemouthed, concise, curt, dazed, dumb, dumbfounded, dumbstricken, dumbstruck, economical of words, inarticulate, indisposed to talk, laconic, mum, mute, nonplussed, quiet, reserved, shocked, short, silent, snug, sparing of words, stricken dumb, taciturn, terse, thunderstruck, tight-lipped, tongue-tied, tongueless, uncommunicative, unloquacious, untalkative, voiceless, word-bound, wordless