Synonyms of retard

1 Syllable
clog, poke, flag, crimp, balk, bog, down, check, mire, lag, stall, loaf
2 Syllables
idled, dwarfed, choked, reefing, arrest, choking, delay, deadens, dawdle, loiter, curbed, staving, hinder, stunting, brake, defers, prevent, deaden, hamper, staved, hinders, defer, falter, noosed, mired, slowed, obstruct, baffle, inched, detain, stave, dammed, slowing, lessen, fetter, detains, trammels, embog, lagged, curbing, damming, slacken, trammel, choke
3 Syllables
preventing, stoppering, handicap, hindered, trammeled, deferring, detaining, reduce, hampered, hampering, hindering, decrease, impede, impeding, impeded, obstructed, deadening, detained, postpone, back-water, trammelling, deadened, encumber, encumbers
4 Syllables
rescheduling, etherize, etherizing, reschedule, etherized, hesitate, encumbered, retardate, encumbering
5 Syllables
procrastinated, procrastinate, procrastinating, decelerate