Synonyms for Fundamental:
elementary, bottom, basic, foundational, underlying, lowest, base.
key, primary, requisite, basal, cardinal, essential, intrinsic, theoretical, supporting, prime, vital, major, necessary, structural, rudimentary, central, elementary, underlying, foundational, crucial, first, principal, bottom, significant, integral, axiomatic, constitutive, elemental.
implicit, inherent, intrinsic, component, deep down, elemental, central, built-in, inwoven, inseparable, integral, ingrained, unalienable.
aboriginal, stark, faultless, decent, honorable, nascent, unsullied, bare, basic, essential, elemental, unalloyed, elementary, plain, undiluted, formative, sinless, stainless, clean, simple, primal, purebred, angelic, irreducible, pure, untainted, unadulterated, white, guiltless, atomic, clear, foundational, blameless, monolithic, spotless, unblemished, indivisible, virtuous, Simon-pure, basal, chaste, primary, innocent, untarnished, unadorned, immaculate, undefiled, uncluttered, prime, austere.
imperial, spartan, harsh, acute, rigid, grim, dry, correct, brisk, disciplined, acerbic, exacting, rigorous, demanding, stark, censorious, hidebound, ascetic, oppressive, authoritarian, piquant, cool, caustic, strict, stern, keen, lean, intense, bleak, relentless, frosty, meticulous, uncompromising, chilly, stringent, stiff-necked, crisp, puritanical, curt, brusque, austere, unbending, sharp, precise, obdurate, raw, blunt, acrimonious, astringent, strait-laced, draconian, abrupt, short, critical, obstinate, basic, inflexible, spare, intolerant, cutting, severe, dour, icy, tart, gruff, prudish.
atomic, undivided, coincident, congruous, coherent, same, indivisible, united, unified, homogeneous, congruent, entire, holistic, irreducible, integrated, intact, monolithic, integral, pure, cohesive, single, elemental, simple, solid, uniform, complete.
n.surface. ultimate. be, constitutive. •base (noun)
basic, underlying, significant, primal, first harmonic, fundamental frequency, profound, important, of import, component, rudimentary, key, cardinal, central.