Synonyms of crucial

1 Syllable

main, key, chief, dire, keyer

2 Syllables

pressing, urgent, searching, right-hand, upstream, hard-won, showdown, rooter, central, telling, touchy, heaton, mainer, chiefest, doozie, needful, heat-on, helpful, righthand, grass-roots, grassroots, vital, front-page

3 Syllables

important, insistent, frontpage, seminal, underlying, high-power, eventful, exigent, called-for, newsworthy, difficult, momentous, life-or-death, pivotal, essential, climatic, compelling, bottom-line, climactic, earth-shaking, hurry-up, life-and-death, fateful, earthshaking, acute, clamorous, deciding

4 Syllables

climacteric, earthshattering, top-priority, difficile, bottomline, coal-and-ice, name-of-the-game, desperate, necessary, all-important, earth-shattering, climactical, determinant, memorable, high-priority, decisive, fundamental, substrative, climatical, major-league

5 Syllables

imperative, operative, pre-requisite, indispensable, axiological

6 Syllables

determinative