onerous

1 difficult to endure had the onerous and stressful job of notifying the families of soldiers killed in action Synonyms bitter, brutal, burdensome, cruel, excruciating, grievous, grim, hard, hardhanded, heavy, inhuman, murderous, harsh, oppressive, rough, rugged, searing, severe, stiff, tough, tryingRelated Words austere, bleak, comfortless, discomforting, forbidding, inhospitable, spartan, uncomfortable; biting, inclement, intemperate, wild; rigorous, strict, stringent; agonizing, heartbreaking, heartrending, painful, wretched; crushing, grinding, overwhelming, wearing; insufferable, insupportable, intolerable, unbearable, unendurable; harrowing, tortuous; bad, disagreeable, hostile, unfriendly, unpleasantNear Antonyms comfortable, cozy, luxurious, snug; agreeable, friendly, genial, hospitable, pleasant; peaceful, relaxing, reposeful, restful; bearable, endurable, painless, tolerable; balmy, calm, clement, gentle, mild, moderate, temperateAntonyms easy, light, soft

2 requiring much time, effort, or careful attention building the scale model of the frigate was an onerous task Synonyms arduous, burdensome, challenging, exacting, grueling (or gruelling), killing, laborious, demanding, persnickety, taxing, toilsomeRelated Words difficult, formidable, hard, herculean, rough, rugged, stiff, strenuous, testing, tough; oppressive, trying; rigid, rigorous, severe, stern, strict, stringentNear Antonyms easy, effortless, facile, simple, smoothAntonyms light, nondemanding, unchallenging, undemanding