crucial
I
adjective
acute, climacteric, conclusive, consequential, critical, deciding, decisive, definitive, determining, essential, exigent, final, grave, imperative, important, influential, instant, material, momentous, of moment, of note, of supreme importance, pivotal, pressing, severe, significant, supreme, urgent, valuable, vital
II
index
acute, central (essential), decisive, essential (required), exigent, imperative, important (significant), important (urgent), indispensable, key, major, mandatory, material (important), momentous, necessary (required), peremptory (imperative), serious (grave), strategic, urgent
Burton's Legal Thesaurus.
William C. Burton.
2006