Thesaurus

Synonyms for Critical include:

academic, acute, admonishing, admonitory, adverse, appraising, bad, barbed, biting, black, blistering, bookish, captious, carping, caviling, censorious, clear, clear-eyed, clear-sighted, critical, critical analysis, critical appraisal, crucial, dangerous, decisive, deprecative, desperate, dire, disapproving, discerning, discriminating, discriminative, discriminatory, disrespectful, donnish, erudite, essential, evaluative, faultfinding, grave, grievous, grim, harmful, hostile, hypercritical, important, inauspicious, indispensable, intellectual, invidious, judicial, learned, life-and-death, life-or-death, life-threatening, mordacious, mordant, necessary, negative, nipping, nitpicking, overcritical, pedantic, percipient, perspicacious, pettifogging, pivotal, polar, prescient, profound, pungent, quibbling, reproachful, reproving, s-shape, sarcastic, sardonic, satiric, satirical, saturnine, scalding, scathing, scholarly, serious, severe, studious, supercritical, uncomplimentary, unfavorable, unfavourable, untoward, vital, vituperative

critical is a ADJ.