Crucial
Pivotal
Synonyms: Pivotal, key, decisive, determining, testing, searching, significant, momentous, weighty, important, epoch-making, life-and-death, critical, climacteric, deciding, settling, trying, major, influential, consequential, big, historic, and far-reaching.
Very important
Synonyms: Very important, of great consequence, critical, pre-eminent, all-important, vital, indispensable, urgent, compelling, needed, requisite, of the utmost importance, of the essence, high-priority, paramount, essential, vitally important, mandatory, pressing, necessary, and required.
Example Sentences
This decision is crucial for success.
Timing is crucial in this situation.
Your feedback is crucial for improvement.
The test results are crucial today.