vital
I
adjective
basic, cardinal, chief, critical, essential, extremely important, fundamental, important, indispensable, irreplaceable, life-supporting, main, necessary to life, needed, paramount, pressing, primary, principal, radical, required, requisite, urgent, vitalic, vital is
II
index
born (alive), cardinal (basic), central (essential), compulsory, critical (crucial), crucial, exigent, fundamental, important (urgent), indispensable, integral, live (conscious), major, mandatory, material (important), necessary (required), obligatory, primary, requisite, strategic, substantive, urgent, viable
Burton's Legal Thesaurus.
William C. Burton.
2006