dispensable

essential, integral, vital, invaluable, important, crucial, irreplaceable, sine qua non, imperative, dispensable, necessary, paramount, useful, critical, infallible, valuable, inexhaustible, inseparable, ideal, anathema, unquestionable, preeminent, reliable, dependable, omnipresent, ubiquitous, authoritative, pivotal, expendable, inextricable, indestructible, indivisible, indisputable, key, helpful, incontestable, irreproachable, influential, unsurpassable, effectual, nonpareil, reformable, matchless, peerless, mutually exclusive, handiest, indefatigable, useless, trustworthy, unquestioned, undependable, marvelous, impossible, quintessential, unavoidable, imperfect, interdependent, priceless, incomparable, excellent, desirable, inalienable, incapable, invisible, transcendent, formidable, irresistible, truest, immutable, summum bonum, axiomatic, capable, instrumental, untouchable, problematic, unequaled, unbreakable, unshakeable, undeniable, superfluous, interchangeable, civilizing, intrinsic, holy grail, beneficial, inestimable, impregnable, inescapable, unfailing, complementary, unshakable, unrivaled, adept, noblest, inviolable, replaceable, ablest, admirable, foremost, treasured, de rigueur, adaptable, express, tell, be, con, hostile, pre, suffice, i.e., serve, viz, believe, cf, derive, direct, makes, operate, put, read, speak, indispensible, portant, overlooked, serviceable, tant, tial, allimportant, prerequisite, bibliographical

., core, core group, essential, necessary, necessity, nucleus, requirement, requisite

obligatory