Synonyms of dumb

1 Syllable

surd, mum, quiet, shush, mute, dull, whist, hushed

2 Syllables

quieter, zaniest, blinded, dried-up, stupid, doltish, oafish, banal, gawkish, reeling, husher, dumbing, clammed, witless, shushes, dopey, shushing, quieting, whister, dopier, duller, cornfed, zanier, speechless, zany, dizzy, dullest, soundless, quietest, dizzier, silent, wordless, shushed, quieted, vacuous, clamming, triper, brainless, stolid, quieten, fooler, mousy

3 Syllables

silentious, stupidest, half-baked, quietened, blunderous, lubberly, silencing, fatheaded, unvocal, obtuse, thickskulled, aphonic, dim-witted, taciturn, thick-headed, squirrelly, tightlipped, dimwitted, blockheaded, thickheaded, noplace, idiotic, voiceless, moronic, tight-lipped, tongue-tied, dumbfounded, quietening

4 Syllables

cockamamy, feeble-minded, feebleminded, simpleminded, loggerheaded, boneheaded, incoherent

5 Syllables

unexpressive, butterfingered, anencephalic, incohesive, anencephalous, unintelligent, inobtrusive

6 Syllables

unarticulate, inarticulate

7 Syllables

uncommunicative, incommunicative