· a person of subnormal intelligence

Synonym(s): idiot, imbecile, cretin, moron, changeling, half-wit

Hypernym(s): simpleton, simple

· cause to move more slowly or operate at a slower rate; "This drug will retard your heart rate"

Hypernym(s): decelerate, slow_down

· be delayed

Hypernym(s): be

· slow the growth or development of; "The brain damage will retard the child's language development"

Synonym(s): check, delay

Hypernym(s): change, alter, modify

· lose velocity; move more slowly; "The car decelerated"

Synonym(s): decelerate, slow, slow_down, slow_up

Hypernym(s): decrease, diminish, lessen, fall