Similar word to urgent:

burning, called-for, capital, chief, clamant, clamorous, compelling, critical, crucial, crying, demanded, demanding, driving, essential, exigent, foremost, heavy, hurry-up, immediate, impelling, imperative, important, importunate, indispensable, insistent, instant, leading, life and death, momentous, necessary, paramount, persuasive, pressing, primary, principal, required, salient, serious, top-priority, touch and go, touchy, vital, wanted, weighty