(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

Full of challenge.

Difficult, hard to do.

present participle of challenge

The act of making a challenge.

An antagonization or instigation intended to convince a person to perform an action they otherwise would not. / A bid to overcome something. / (sports) An attempt to take possession; a tackle.

(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.

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.

plural of challenge