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critical 
1 captious, carping, cavilling, censorious, derogatory, disapproving, disparaging, fault-finding, nagging, niggling, nit-picking  (informal) on someone's back  (informal) scathing 
2 accurate, analytical, diagnostic, discerning, discriminating, fastidious, judicious, penetrating, perceptive, precise 
3 all-important, crucial, dangerous, deciding, decisive, grave, hairy  (slang) high-priority, momentous, now or never, perilous, pivotal, precarious, pressing, psychological, risky, serious, urgent, vital, appreciative, approving, complimentary, permissive, safe, secure, settled, uncritical, undiscriminating, unimportant