exigent Synonyms

crying instant exacting insistent clamant weighty oppressive life-and-death onerous obligatory necessary momentous malcontented laborious life-or-death pressing rigorous serious vital urgent tough taxing superincumbent strict strenuous significant of the essence severe importunate important acute crucial critical compulsory compelling climacteric clamorous challenging burning burdensome demanding desperate difficult imperative immediate heavy harsh hard grave formidable