Obamacare is not just a dumb law but a deeply offensive one (on this at least, the American people have my back).
What people are really afraid of is something that has its own vocabulary and idiom because it strikes them dumb.
It is clear that a mayor who is not putting all their eggs in “smart” is too dumb to be elected.
Old English dumb "silent, unable to speak," from PIE *dheubh- "confusion, stupefaction, dizziness," from root *dheu- (1) "dust, mist, vapor, smoke," and related notions of "defective perception or wits."
The Old English, Old Saxon (dumb), Gothic (dumbs), and Old Norse (dumbr) forms of the word meant only "mute, speechless;" in Old High German (thumb) it meant both this and "stupid," and in Modern German this latter became the only sense. Meaning "foolish, ignorant" was occasionally in Middle English, but modern use (1823) comes from influence of German dumm. Related: dumber; dumbest.
Applied to silent contrivances, hence dumbwaiter. As a verb, in late Old English, "to become mute;" c.1600, "to make mute." To dumb (something) down is from 1933.
from natural infirmity (Ex. 4:11); not knowing what to say (Prov. 31:8); unwillingness to speak (Ps. 39:9; Lev. 10:3). Christ repeatedly restored the dumb (Matt. 9:32, 33; Luke 11:14; Matt. 12:22) to the use of speech.