tortuous, excruciating, arduous, agonizing, hellish, painful, grueling, tedious, laborious, exhausting, harrowing, unendurable, interminable, nightmarish, brutal, sisyphean, cruel, treacherous, unpleasant, purgatorial, circuitous, miserable, toilsome, convoluted, humiliating, maddening, kafkaesque, frustrating, terrifying, lengthy, unbearable, strenuous, exasperating, wretched, gruesome, hellacious, horrendous, cathartic, horrific, tiresome, enervating, wrenching, inhumane, perilous, unmerciful, ghastly, labyrinthine, monotonous, painstaking, squalid, inglorious, anticlimactic, unforgiving, horrid, joyless, protracted, dreadful, bizarre, horrible, wearisome, heartbreaking, stressful, dreary, horrifying, bearable, messy, fruitless, unrewarding, numbing, sadistic, merciless, anguishing, abominable, ignominious, bumpy, bewildering, gruelling, unilluminating, complicated, nauseating, masochistic, futile, sordid, exhilarating, mortifying, unsatisfying, verminous, terrible, grisly, depressing, tortured, traumatic, undignified, hideous, unrelieved, cumbersome, inhuman, riveting, grotesque, diabolical, pointless, atrocious, racking, wracking, agonising, uncomfortable, difficult, hectic, uneventful, fatiguing

agonizing, excruciating, harrowing, painful, torturesome, torturing