Indefatigable, Industrious, Intricate, Killing, Knotted, Knotty, Mean, Obdurate, Obstinate, Onerous, Oppressive, Overworked, Painful, Painstaking, Persevering, Persistent, Ponderous, Punishing, Relentless, Rigorous, Rough, Rugged, Scrupulous, Severe, Sleepless, Spiny, Steadfast, Steady, Steep, Stiff, Strained, Strenuous, Stubborn, Taxing, Thorny, Thorough, Ticklish, Tireless, Tiring, Tough, Tricky, Troublesome, Unflagging, Unrelenting, Unremitting, Untiring, Unwavering, Unwearied, Uphill, Vehement, Wearisome, Wearying, Wicked, Zealous, Abstruse, Ardent, Arduous, Assiduous, Brutal, Burdensome, Careful, Complex, Critical, Crushing, Delicate, Demanding, Detailed, Determined, Difficult, Diligent, Dogged, Energetic, Exacting, Exhausting, Exhaustive, Fatiguing, Fervent, Forced, Formidable, Grueling, Hairy, Hard, Hardworking, Heavy, Hefty
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