mum

Synonyms and related words:

anaudic, aphasic, aphonic, breathless, brief, brusque, close, close-tongued, closemouthed, concise, curt, dumb, dumbfounded, dumbstricken, dumbstruck, economical of words, inarticulate, indisposed to talk, laconic, ma, mam, mama, mammy, mater, mom, mommy, mummy, mute, old woman, quiet, short, silent, snug, sparing of words, speechless, stricken dumb, taciturn, terse, tight-lipped, tongue-tied, tongueless, unloquacious, untalkative, voiceless, word-bound, wordless