"arduous" synonyms, related words, and opposites

Similar:

laborious, difficult, toilsome, grueling, gruelling, labourious, backbreaking, effortful, strenuous, heavy, more...

Opposite:

easy, effortless, simple, uncomplicated, painless

Types:

difficult, hard, tiring, exhausting, taxing, more...

Meter:

Colors:

charcoal, slate gray, midnight blue, forest green, maroon, burgundy, rust, burnt sienna, umber, taupe

Crossword clues:

very difficult, extremely difficult, exigent endeavor, back breaking, long and hard, very difficult job, difficult trying, grueling nature, long and difficult, severe; difficult