Synonyms of critical

1 Syllable
main, sharp
2 Syllables
pressing, urgent, twitchy, fussy, trickiest, nagging, carping, trickier, edgier, captious, humbling, scolding, waspy, ticklish, grousing, fretful, peevish, grumbly, tricky, putout, rooter, direr, niggling, biting, parlous, direst, choicy, picky, trenchant, heaton, choosey, mainer, fed-up, ennuied, put-out, doozie, pickier, sorest, heat-on, sorer, critic, edgy, cutting, vital, front-page
3 Syllables
important, demanding, frontpage, choleric, seminal, underlying, high-power, eventful, withering, scrupulous, exigent, called-for, caviling, cavillous, censorious, condemning, hairsplitting, reproachful, complaining, newsworthy, diagnostic, backbreaker, finical, clocklike, cynical, momentous, sarcastic, life-or-death, discerning, finicky, jeopardous, demeaning, nit-picking, censuring, lowering, pivotal, abscessed, severe, dangerous, fastidious, nit-picky, climactic, literal, unsated, earth-shaking, exacting, finicking, hurry-up, life-and-death, fateful, earthshaking, strategic, deciding, querulous, belittling, ironic
4 Syllables
demystifying, demythifying, reinterpreting, cantankerous, earthshattering, undeviating, top-priority, disapproving, disparaging, exceptive, detractive, dissatisfied, satirical, particular, coal-and-ice, name-of-the-game, hermeneuti, unflattering, diagrammatic, hermeneutic, dangersome, penetrating, immediate, unappeased, unassuaged, all-important, earth-shattering, climactical, memorable, revisionist, high-priority, decisive, culpatory, ulcerated, climatical, major-league, double-edged
5 Syllables
expository, paradoxical, imperative, interpretive, calumniatory, overcritical, hypercritical, hermeneutical, depreciatory, deprecatory, depreciative, declarative, derogative, expositional, discriminating, explanatory, derogatory, analytical, deconstructionist, deprecative
6 Syllables
interpretative, overparticular, unexaggerated, elucidatory, uncomplimentary