Arduous — synonyms, definition

1. arduous (a)

Herculean abrupt burdensome difficult distressing disturbing effortful emphatic energetic exhausting fatiguing grinding grueling gruelling hard heavy high intense labored laborious • • •

2. arduous (Adjective)

backbreaking operose punishing straining

arduous (Adjective) — Characterized by effort to the point of exhaustion; especially physical effort. ex. "worked their arduous way up the mining valley"

arduous (Adjective) — Taxing to the utmost; testing powers of endurance. ex. "your willingness after these six arduous days to remain here"

arduous (Adjective) — Difficult to accomplish; demanding considerable mental effort and skill. ex. "the arduous work of preparing a dictionary"