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difficult challenging uneasy complex complicated hard impossible laborious grueling gruelling punishing tiresome unendurable demanding exhausting fatiguing intricate troublesome arduous backbreaking crippling daunting depleting intense laboured labored merciless tormenting tortuous torturesome torturous trying unbearable agonising agonizing ambitious back-breaking bothersome bruising brutal burdensome colossal cruel crushing cumbersome debilitating dicey discomforting distressful distressing draining drudgy easier said than done effortful energy-consuming exacting excruciating extreme ferocious fierce forbidding galling gargantuan grievous grim grinding hairy hard-won harrowing harsh hazardous heavy hellish herculean Herculean high-impact high-pressure immense insufferable intimidating intolerable jarring killer killing knackering like getting blood out of a stone marathon moiling nerve-racking no picnic not easy ominous onerous operose oppressive painful painstaking ponderous problematic prohibitive rigorous rough rugged sapping savage scabrous severe shattering slavish solemn staggering sticky strenuous stressful sweaty taxing tedious testing thorny tiring titanic toilful toilsome tough tough going troubling uncomfortable unforgiving unnerving unpleasant unremitting unsparing unyielding uphill uphill battle upstream vicious vigorous wearing wearisome wearying weighty worksome abstruse formidable involved knotty murderous obscure problematical recondite stiff unclear unintelligible vague

a snare as new a snip a snowman a soap asocial a snack as much as possible as much as is viable as much as is feasible as much as is achievable as much as