Synonyms and related words :
actuating, acute, animating, causal, causative, clamorous, coactive, compulsive, compulsory, constraining, critical, crucial, crying, decretal, decretive, decretory, dictating, directive, driving, exigent, gripping, high-pressure, high-priority, holding, impelling, imperative, imperious, impulsive, inducive, insistent, instant, instructive, irresistible, jussive, mandating, motivating, motivational, motive, moving, obligating, obsessing, obsessional, obsessive, peremptory, pivotal, possessing, preceptive, preoccupying, prescriptive, pressing, restraining, urgent,