سخت (صفت)
firm, hard, rigid, serious, solid, difficult, stringent, laborious, dogged, adamantine, tough, strict, strong, sticky, troublesome, exquisite, chronic, heavy, formidable, grim, demanding, arduous, ironclad, indomitable, austere, exacting, severe, stout, rugged, grave, intense, violent, callous, inexorable, trenchant, tense, crusty, difficile, trying, dour, intolerable, flinty, stony, petrous, hard-shell, irresistible, insupportable, inflexible, insufferable, labored, steely, rigorous, rocky, unsparing
دشوار (صفت)
hard, difficult, uphill, knotted, sore, laborious, tough, sticky, formidable, arduous, onerous, strait, intolerable, slippery, slippy, inexplicit, insupportable, inexplicable, nerve-racking, spinose, spiny
طاقت فرسا (صفت)
onerous, repugnant, exhausting, intolerable, unbearable, unsupportable, unendurable, insupportable, insufferable, torturous
غیر قابل مقاومت (صفت)
ineluctable, irresistible, insupportable
تحمل ناپذیر (صفت)
intolerable, unbearable, insupportable, insufferable