onerous Synonyms

taxing demanding wearing difficult burdensome troublesome tough punishing toilsome tiring tedious rugged superincumbent rigorous strenuous steep sisyphean severe trying unwieldy uphill time-consuming effortful back-breaking heavy-handed heavier gruelling grueling backbreaking worrisome weighty wearying wearisome vexatious upstream problematic ponderous painful formidable fatiguing expensive exigent exhausting exacting enervative enervating arduous dear cumbrous cumbersome