Definition of retardate in English:

retardate

noun

North American
dated, offensive
  • A person who has a mental disability.

    fool, idiot, cretin, moron, dolt, halfwit, ass, dunce, dullard, simpleton, nincompoop, blockhead, ignoramus, clod
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Origin

1950s: from Latin retardat- ‘slowed down’, from the verb retardare (see retard).

Pronunciation

retardate

/rɪˈtɑːdeɪt/