substantial, adj. 1. considerable, significant, sizable, major, big, great, grand; large, goodly, tidy, healthy, Inf. tall; Inf. big-league, Inf. major-league, Inf. pro, Inf. heavyweight, Inf. big-time; consequential, weighty, momentous, bulky; notable, noteworthy, marked.
2. real, actual, physical; material, corporeal, incarnate, bodily, somatic, fleshly; palpable, tangible, ponderable, concrete; temporal, earthly, secular; hypostatic, hylic, hylozoistic, materialistic; appreciable, sensible, substantive.
3. firm, strong, solid, hard; stout, massive, big; stable, sound, steady, steadfast, staunch; fast, secure, close; durable, lasting, perdurable, longstanding.
4. compact, dense, tight, thick, packed; concentrated, crowded, jammed, crammed; close-set, thickset, heavy, serried; impenetrable, impermeable, imporous, solid.
5. wealthy, prosperous, well-to-do, rich; flush, flourishing, thriving, affluent; influential, prestigious, powerful, forceful; landed, propertied, moneyed, well-heeled; responsible, solvent, independent, unindebted.
6. essential, fundamental, basic, constitutional, basal, primal; necessary, vital, indispensable, imperative; material, serious, grave, grievous; important, significant, valuable.
7. valid, true, veritable, genuine, authentic; existent, substantive, factual, Latin, de facto-, positive, absolute, undeniable, reliable, plain, authoritative.
substantiality, n. actuality, reality, corporeality, physicality. See - substance (def. 2).
substantiate, v. 1. prove, establish, demonstrate, ascertain; manifest, evidence, show clearly, document; validate, authenticate, confirm, verify, certify; corroborate, bear out, support, sustain, back up, uphold, vindicate, justify, circumstantiate; vouch for, warrant, guarantee, avouch, attest to, swear to, testify to, endorse.
2. materialize, embody, incarnate, reify, solidify; actualize, realize, externalize, exteriorize, hypostatize.
3. strengthen, breathe life into, flesh out, invigorate, animate; reinforce, bolster, build up.
substantiation, n. 1. proof, documentation, validation, authentication, confirmation, verification, certification; corroboration, vindication, circumstantia-tion, endorsing; establishment, acknowledgment, avowal, acceptance.
2. embodiment, reification, realization, actualization; animation, strengthening.
substitute, n. 1. sub, succedaneum, replacement, alternate, backup, relief, fill-in; agent, proxy, dummy, surrogate, secondary, deputy, vicar, Chiefly Brit. locum tenens, regent, chargd d'affaires; understudy, stand-by, double, stand-in, SI. ringer, imitation, copy, fake, second, changeling; pinch hitter, designated hitter, relief pitcher, pinch runner, second string or team, bench warmer; scapegoat, whipping boy.
-v. 2. replace, relieve, sub, fill in, back up, Inf. cover, do duty for; stand in, understudy, take the place of, double for, pinch-hit; supersede, supplant; SI. take the rap for.