Variation of the adverb form of "retard," more commonly known as "retardedly."
Both "retardly" and "retardedly" are equally accepted as correct adverb forms of "retard" in colloquial English.
"But basically, when everyone is made to act retardly, it Introduction to Dance becomes kinda fun." (01/28/09)
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defining someone who acts retarded, and or acting stupid
Justin is showing his retardliness more than needed