retarded
adjective
re·tard·ed ri-ˈtär-dəd 
1
dated, now offensive : affected by intellectual disability : intellectually disabled
Note: The term retarded is increasingly considered offensive. The use of intellectually disabled is now preferred over retarded in medical, educational, and regulatory contexts, as well as in general use.
2
informal + offensive : very stupid or foolish
Word History
First Known Use
1895, in the meaning defined at sense 1
Medical Definition
retarded
adjective
re·tard·ed ri-ˈtärd-əd
dated, now offensive
: affected by intellectual disability : intellectually disabled
retarded 1 of 2
adjective
as in immature
Synonyms & Similar Words
Relevance
- immature
- backward
- primitive
- undeveloped
- underdeveloped
- rudimentary
- lower
- uneducated
- rude
- nonprogressive
- undersized
- underweight
- uncivilized
- green
- unripened
- unripe
- savage
- low
- undersize
- early
- embryonic
- obsolete
- antiquated
- primordial
- old
- primeval
- dated
- antediluvian
- germinal
- outworn
- past
- passé
- hoary
- antique
- fusty
- out-of-date
- oldfangled
- musty
- Neanderthal
- old-fashioned
- old-time
- Neandertal
Antonyms & Near Antonyms
- advanced
- evolved
- progressive
- improved
- higher
- developed
- high
- refined
- late
- precocious
- forward
- full-blown
- full-fledged
- full-scale
retarded
2 of 2verb
as in slowed
to cause to move or proceed at a less rapid pace an herbicide to retard the growth of weeds Synonyms & Similar Words
- slowed
- braked
- inhibited
- handicapped
- hindered
- decelerated
- stopped
- impeded
- restrained
- slackened
- halted
- hampered
- obstructed
- tied up
- set back
- held back
- thwarted
- curbed
- checked
- frustrated
- hobbled
- baffled
- encumbered
- arrested
- constrained
- sabotaged
- bottlenecked
- reined
- foiled
- held up
Antonyms & Near Antonyms
- accelerated
- rushed
- hurried
- pushed
- hastened
- stepped up
- encouraged
- urged
- advanced
- drove
- stirred
- spurred
- propelled
- sped (up)
- aided
- helped
- quickened
- forwarded
- facilitated
- goaded
- expedited
- speeded (up)
- dispatched
- eased
- furthered