Pocket Thesaurus
Antonyms of impede
cut off, retard, slow, thwart, stymie, deter, delay, curb, interfere, disrupt, hamper, block, discomfit, clog, bar, rattle, dam, stop, stonewall, freeze, faze, restrain, oppose, embarrass, brake, check, disconcert, hold up, shut down, blow whistle on, close off, flag one, hang up, saddle with, shut off, slow down, cramp one's style
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