integral

1 being a part of the innermost nature of a person or thing <a car dealer respected for his integral honesty and straightforwardness with customers> Synonyms built-in, constitutional, constitutive, essential, hardwired, immanent, inborn, inbred, indigenous, ingrain, ingrained (also engrained), innate, inherent, intrinsic, native, naturalRelated Words basic, deep-rooted, elemental, fundamental; congenital, hereditary, inherited, inmost, inner, interior; internal; characteristic, distinctive, peculiar; habitual, inveterate; normal, regular, typicalNear Antonyms alien, foreign; accidental, coincidental, incidental; acquired, adscititious; superficial, surface; exterior, externalAntonyms adventitious, extraneous, extrinsic

2 impossible to do without <she's an integral member of the team of archaeologists at that dig> Synonyms all-important, critical, imperative, indispensable, essential, must-have, necessary, necessitous, needed, needful, required, requisite, vitalRelated Words prerequisite; compulsory, mandatory, nonelective, obligatory; consequential, crucial, important, major, material, meaningful, momentous, significant, substantial, weighty; basic, central, fundamental, key, organic; insistent, persistent, pressing, urgentNear Antonyms undesired, unwanted; inconsequential, insignificant, unimportant; excess, external, extra, extraneous, superfluous, surplusAntonyms dispensable, inessential, needless, nonessential, unessential, unnecessary, unneeded

3 not lacking any part or member that properly belongs to it <a prep school that adheres to the belief that athletics are essential to an integral life> Synonyms compleat, comprehensive, entire, full, grand, intact, complete, perfect, plenary, total, wholeRelated Words unabridged, uncut, undiminished; all-out, exhaustive, extensive, maximal; full-blooded, full-blown, full-bore, full-fledged, full-on, full-out, full-scaleNear Antonyms abbreviated, abridged, cut, diminished, reducedAntonyms imperfect, incomplete, partial