Synonyms to irreductible

essential, ab ovo, austere, axiom, bare, bare necessities, basal, basic, basilar, bedrock, bench mark, brass tacks, call for, called for, capital, cardinal, cardinal point, center, central, chaste, chief, chief thing, climax, condition, congenital, connate, constituent, constitutional, constitutive, core, cornerstone, crisis, critical point, crux, deep-seated, demand, demand for, desideration, desideratum, element, elemental, elementary, elixir, essence, essential facts, essential matter, essentials, flower, focal, focus, foremost, fundamental, gist, gravamen, great point, gut, heart, high point, homely, homespun, homogeneous, hypostasis, imperative, important, important thing, inborn, inbred, indicated, indispensable, indivisible, innate, inner essence, intrinsic, irreducible, irreplaceable, issue, kernel, key, keystone, landmark, leading, life-and-death, life-or-death, main, main point, main thing, marrow, material, material point, meat, mere, milestone, monolithic, must, must item, necessaries, necessary, necessities, necessitous, necessity, need, need for, needed, needful, nub, nucleus, nuts and