Full of challenge.

Able to be challenged or disputed.

plural of Challenger

One who challenges; especially, one who plays against the current champion of a game or contest in hopes of winning and becoming the new champion.

(transitive) To invite (someone) to take part in a competition. / (transitive) To dare (someone). / (transitive) To dispute (something). / To call something into question or dispute.

(euphemistic) Lacking some physical or mental attribute or skill ; used after adverbs to make politically correct adjectives.

simple past tense and past participle of challenge

plural of challenge

Third-person singular simple present indicative form of challenge

plural of challenger