(a.) Laborious; wearisome; as, toilsome work\.

Herculean abstruse arduous backbreaking brutal burdensome complex critical crushing delicate demanding difficile difficult draining effortful enervating exacting exhausting fatiguesome fatiguing forced formidable grueling hairy hard hard-earned hard-fought heavy hefty intricate jawbreaking killing knotted knotty labored laborious mean no picnic not easy onerous operose oppressive painful punishing rigorous rough rugged set with thorns severe spiny steep strained straining strenuous stressful thorny ticklish tiresome tiring tough tricky troublesome trying uphill weariful wearing wearisome wearying wicked