What is another word for retarded?

Need synonyms for retarded? Here's a list of words from our thesaurus that you can use instead.

Adjective
Mentally deficient or underdeveloped
Verb
Simple past tense for to prevent from progress
“A new gas-based fire-protection system has also been installed, which reduces the level of oxygen in the room to retard a fire.”
Verb
Past participle for to prevent from progress
“A new gas-based fire-protection system has also been installed, which reduces the level of oxygen in the room to retard a fire.”
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