Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

1810, "delayed," past participle adjective from retard (v.). In childhood development sense, "mentally slow," attested from 1895 (cf. Italian tardivi).

MORE RELATED WORDS FOR RETARDED

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.