What is an antonym for challenge?

Answer 1

An antonym or opposite word for challenging would be easy. You could also say effortless or simple.

Answer 2

A couple antonyms for challenge are, agree, answer, decide, win, agreement, decision, or victory. It really depends on how you use the word in question.
The opposite of challenging something is accepting it, so the antonym for challenge is acceptance. There is not a direct antonym for other uses of the word.