dumber

Adjective

dumb (comparative dumber, superlative dumbest)

1. (dated) Unable to speak; lacking power of speech.
   • deaf, dumb, and blind

   Synonyms:

   mute, speechless, wordless

2. (archaic) Not talkative; taciturn or unwilling to speak.
3. (dated) Having no input or voice in running things.
   • Life was never a May-game for men; in all times the lot of the dumb-millions born to toil was defaced with manifold sufferings, injustices, heavy burdens, avoidable and unavoidable; not play at all, but hard work that made the sinews sore, and the heart sore.1843 April, Thomas Carlyle, “Democracy”, in Past and Present, American edition, Boston, Mass.: Charles C[offin] Little and James Brown, published 1843, →OCLC, book III (The Modern Worker), page 210
4. (dated, usually, actions) Unaccompanied by words or speech, silent, wordless.
   • dumb show
5. (dated) Not producing any sound, silent.
   • […] Thro’ lands where not a leaf was dumb;
     ⁠But all the lavish hills would hum
     The murmur of a happy Pan: […]1850, [Alfred, Lord Tennyson], “Canto XXIII”, in In Memoriam, London: Edward Moxon, […], →OCLC, page 39
6. (derogatory, especially, informal) Stupid.
   • You are so dumb! You don't even know how to make toast!

   Synonyms:

   feeble-minded, idiotic, moronic, stupid, addlebrained, addlepated, airheaded, bee-brained, beef-witted, soft

   Antonyms:

   intelligent, smart

See all 17 meanings of dumb