unfastidious

meticulous, rigorous, fastidious, stringent, uncompromising, scrupulous, unforgiving, precise, punctilious, strict, unmerciful, ruthless, painstaking, satisfying, pitiless, machinelike, obsessive, unrelenting, dauntingly, finicky, intense, merciless, discerning, arduous, assiduous, implacable, intricate, rigid, unerring, unsentimental, toilsome, onerous, pedantic, insistent, unsurpassed, excruciating, adamantine, remorseless, laborious, unvarying, maniacal, brutal, exquisite, artful, relentless, abasement, sadistic, masterly, austere, ferocious, insatiable, brutish, grueling, condign, impeccable, unsparing, steely, idiosyncratic, subjective, sophisticated, unexcelled, unshowy, peerless, unbendable, monomaniacal, pernickety, unimpeachable, sanguinary, voracious, unsurpassable, torturous, unbending, dostoevskian, immaculate, tedious, inscrutable, unflinching, saturnine, refined, procrustean, dextrous, esoteric, fiendish, unremitting, skillful, reverential, superlative, ennobling, unblinking, brusk, adroit, beastly, perverse, unyielding, delicate, tractable, puristic, unrivaled, exceptional, ritualised, detailed, vengeful, arbitrary, utilitarian, warlike, winning, modern, pretension, tender, ancient, baffling, basic, caution, convincing, defensive, defining, devout, difficulty, distinguishing, doubt, doubting, favor, demanding, exigent, burdensome, timeconsuming, irksome, stricter, undemanding, unobtrusive, consuming, routine, uncongenial, lenient, humdrum

finical, finicky, fussy, particular, unfastidious

stern