(Offensive
slang) used as a disparaging and abusive term for a person who has
intellectual disabilities, originally US.
By extension, you can use this word to describe a person who is extremely foolish,
dumb or stupid.
Retard usage
Note: this word is pronounced as ‘
REE-tard’, not ‘ri-TARD’ (inoffensive sense for
delay or slow down).
Note: this word is outdated and considered
offensive and the senses above should be avoided.