Challenging
Synonyms: Demanding, taxing, exigent, stretching, stimulating, energizing, difficult, hard, stiff, onerous, laborious, strenuous, testing, exacting, searching, exciting, inspiring, inspirational, tough, heavy, formidable, arduous, burdensome, and gruelling.
Dare
Synonyms: Dare, invite, throw down the gauntlet to, summon, bid, and defy someone to do something.
Example Sentences
This project is challenging but rewarding.
The workout was extremely challenging today.
Solving the puzzle felt challenging yet fun.
Learning a new language is challenging.
The exam questions were challenging for everyone.