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1.
When something happens over and over in a similar way (redundantly) and that something happens to be completely retarded.

retardedly redundant.
Why does Joe keep trying to jump that ridge he just keeps hurting himself?

Yeah, it is getting a tad retundant.
by TheKoister June 16, 2010
 
2.
A word that can replace any adjective, positive or negative, and expresses much enthusiasm
a)Damn, that food was retundant!
b)That movie sucked; it was retundant.
by LEZLEE July 01, 2004