imperative

Synonyms

all-important, critical, essential, indispensable, integral, must-have, necessary, necessitous, needed, needful, required, requisite, vital;

Antonyms

dispensable, inessential, needless, nonessential, unessential, unnecessary, unneeded;

Near Antonyms

undesired, unwanted;

inconsequential, insignificant, unimportant;

excess, external, extra, extraneous, superfluous, surplus;

Related Words

prerequisite;

compulsory, mandatory, nonelective, obligatory;

consequential, crucial, important, major, material, meaningful, momentous, significant, substantial, weighty;

basic, central, fundamental, key, organic;

insistent, persistent, pressing, urgent;

Phrases

of the essence;

Synonyms

burden, charge, commitment, duty, incumbency, need, obligation, office, responsibility;

Near Antonyms

grace, postponement, stay;

discharge, ease, exemption, release, relief, waiver;

loophole;

alternative, choice, option, pick, preference, selection;

Related Words

oath, pledge, promise, vow, word;

arrangement, prearrangement, setup;

compact, contract, covenant, pact, trust;

debt, payment, tribute;

compulsion, constraint, restraint;

must, requirement;

coercion, duress, force;

appointment, engagement, reservation;

burden, onus;