| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | fundamental, basic |
| Synonyms: | basal, bottom, cardinal, constitutional, deep-seated, essential, foundational, inherent, innate, intrinsic, meat-and-potatoes, native, natural, organic, original, primal, primary, primitive, profound, thoroughgoing, underlying, vital |
| Antonyms: | extrinsic, nonessential, superficial |
| Main Entry: | resonant |
| Part of Speech: | adjective |
| Definition: | vibrant in sound |
| Synonyms: | beating, booming, clangorous, consonant, deep, deep-toned, earsplitting, echoing, electrifying, enhanced, full, heightened, intensified, loud, mellow, noisy, orotund, plangent, powerful, profound, pulsating, pulsing, resounding, reverberant, reverberating, rich, ringing, roaring, round, sonorant, sonorous, stentorian, strident, thrilling, throbbing, thundering, thunderous |
| Antonyms: | faint, quiet |
| Main Entry: | shrewd |
| Part of Speech: | adjective |
| Definition: | clever, intelligent |
| Synonyms: | acute, argute, artful, astucious, astute, brainy, cagey, calculating, canny, crafty, cunning, cutting*, deep*, discerning, discriminating, farsighted, foxy*, heady, in the know, ingenious, inside, judicious, keen, knowing, on the inside, on top of, penetrating, perceptive, perspicacious, piercing, probing, profound, prudent, quick-witted, sagacious, savvy*, sensible, shark, sharp, slick*, slippery*, sly, smart, smooth, streetwise, tricky, underhand, up on, wily, wise, wised up |
| Antonyms: | foolish, frivolous, naive, stupid, unthinking |
| Main Entry: | sound |
| Part of Speech: | adjective |
| Definition: | logical, reasonable |
| Synonyms: | accurate, advisable, all there, cogent, commonsensical, consequent, convincing, cool*, correct, deep, exact, fair, faultless, flawless, got it together, impeccable, intellectual, judicious, just, levelheaded, orthodox, precise, profound, proper, prudent, rational, reliable, responsible, right, right-minded, right-thinking, satisfactory, satisfying, sensible, sober, solid, telling, thoughtful, together*, true, trustworthy, valid, well-advised, well-founded, well-grounded, wise |
| Antonyms: | illogical, unbelievable, unfathomable, unreasonable, unsound |
| Main Entry: | subtle |
| Part of Speech: | adjective |
| Definition: | nice, quiet, delicate |
| Synonyms: | attenuate, attenuated, deep, discriminating, ethereal, exquisite, faint, fine, finespun, hairline, hairsplitting, illusive, implied, inconspicuous, indirect, indistinct, inferred, ingenious, insinuated, mental, penetrating, profound, refined, slight, sophisticated, suggestive, tenuous, thin, understated |
| Antonyms: | hard, harsh, noisy, unsubtle |
| Main Entry: | unbroken |
| Part of Speech: | verb |
| Definition: | continuous, whole |
| Synonyms: | ceaseless, constant, deep, endless, entire, even, fast, incessant, intact, perfect, perpetual, profound, progressive, regular, solid, sound, successive, total, undisturbed, unimpaired, uninterrupted, unremitting, unruffled, untroubled |
| Antonyms: | broken, discontinuous, inconstant, intermittent, partial |
| Main Entry: | unfathomable |
| Part of Speech: | adjective |
| Definition: | hard to believe; difficult to understand |
| Synonyms: | abstruse, baffling, clear as mud, deep, enigmatic, esoteric, heavy, impenetrable, incognizable, incomprehensible, indecipherable, inexplicable, obscure, profound, too deep, uncomprehensible, ungraspable, unintelligible, unknowable |
| Antonyms: | believable, comprehensible, fathomable |
| Main Entry: | over one's head |
| Part of Speech: | adjective |
| Definition: | not understandable |
| Synonyms: | baffling, bewildering, beyond comprehension, beyond one, complex, complicated, deep, hard to understand, incomprehensible, profound, unfathomable |
| Main Entry: | thorough |
| Part of Speech: | adjective |
| Definition: | all-encompassing |
| Synonyms: | absolute, accurate, arrant, careful, complete, comprehensive, consummate, detailed, exact, exhaustive, extreme, finished, full, ingrained, intensive, meticulous, out-and-out, painstaking, profound, thoroughly, unmitigated, utter |
| Antonyms: | cursory, partial, sciolistic, superficial |