| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | unseen, secret |
| Synonyms: | QT, abstruse, buried, clandestine, cloaked, close, clouded, concealed, covered, covert, cryptic, dark, disguised, eclipsed, esoteric, hermetic, hermetical, imperceivable, in the dark, indiscernible, invisible, latent, masked, mysterious, mystic, mystical, obscure, occult, out of view, private, recondite, screened, secluded, sequestered, shadowy, shrouded, surreptitious, ulterior, undercover, underground, undetected, undisclosed, unexposed, unknown, unrevealed, veiled, withheld |
| Antonyms: | bare, exhibited, exposed, open, out, seen, showing, uncovered |
| Main Entry: | clandestine |
| Part of Speech: | adjective |
| Definition: | secret, sly |
| Synonyms: | artful, cloak-and-dagger, closet, concealed, covert, foxy, fraudulent, furtive, hidden, hush-hush, illegitimate, illicit, in holes and corners, on the Q. T., on the quiet, private, sneaky, stealthy, surreptitious, under wraps, under-the-counter, undercover, underground, underhand |
| Antonyms: | aboveboard, forthright, open, truthful |
| Main Entry: | cloistered |
| Part of Speech: | adjective |
| Definition: | secluded |
| Synonyms: | cloistral, confined, hermitic, hidden, insulated, recluse, reclusive, restricted, secluse, seclusive, sequestered, sheltered, shielded, shut off, withdrawn |
| Antonyms: | free, open, unsecluded |
| Main Entry: | close |
| Part of Speech: | adjective |
| Definition: | secret, reserved |
| Synonyms: | buttoning one's lip, buttoning up, clamming up, close-lipped, closemouthed, hidden, hush-hush, mum's the word, on the Q. T., private, reticent, retired, secluded, secretive, silent, taciturn, tight chops, tight-lipped, uncommunicative, unforthcoming, zipping one's lips |
| Antonyms: | open, unreserved |
| Main Entry: | complex |
| Part of Speech: | adjective |
| Definition: | difficult to understand |
| Synonyms: | Byzantine, Daedalean, Gordian, abstruse, bewildering, circuitous, complicated, confused, convoluted, crabbed, cryptic, discursive, disordered, disturbing, enigmatic, entangled, excursive, hidden, impenetrable, inscrutable, interwoven, intricate, involved, jumbled, knotted, knotty, labyrinthine, mazy, meandering, mingled, mixed, muddled, obscure, paradoxical, perplexing, puzzling, rambling, recondite, round-about, sinuous, snarled, sophisticated, tangled, tortuous, undecipherable, unfathomable, winding |
| Notes: | something complex may be well-organized and logically constructed as well as subtle and intricate, while a thing that is complicated will have something irregular, perverse, asymmetrical in addition to fundamental intricacy; complex is more formal and technical (a problem in mathematics is complex) while something like personal life can be complicated |
| Antonyms: | apparent, clear, direct, discernible, easy, evident, obvious, plain |
| Main Entry: | covert |
| Part of Speech: | adjective |
| Definition: | clandestine, underhanded |
| Synonyms: | QT, buried, camouflaged, cloaked, concealed, disguised, dissembled, furtive, hidden, hush-hush, incog, incognito, masked, obscured, private, privy, secret, shrouded, stealthy, sub rosa, surreptitious, ulterior, under wraps, under-the-table, undercover, underhand, unsuspected, veiled |
| Notes: | covert (concealed, covered, hidden) is the opposite of overt (apparent, open to view, plain, public) |
| Antonyms: | aboveboard, candid, frank, honest, open, overt, public, unconcealed |
| Main Entry: | cryptic |
| Part of Speech: | adjective |
| Definition: | secret; obscure in meaning |
| Synonyms: | Delphian, Delphic, abstruse, ambiguous, apocryphal, arcane, cabalistic, dark, enigmatic, equivocal, esoteric, evasive, hidden, incomprehensible, inexplicable, murky, mysterious, mystic, mystical, mystifying, occult, opaque, oracular, perplexing, puzzling, recondite, secretive, strange, tenebrous, unclear, unfathomable, uninformative, vague, veiled |
| Notes: | cryptic coloration helps conceal an animal; phaneric coloration makes an animal stand out |
| Antonyms: | clear, obvious, plain, seen, straightforward |
| Main Entry: | deep |
| Part of Speech: | adjective |
| Definition: | abstract, complicated in meaning |
| Synonyms: | Delphic, Orphic, Sibylline, abstruse, acute, arcane, complex, concealed, difficult, discerning, esoteric, hard to understand, heavy*, hermetic, hidden, incisive, intricate, learned, mysterious, obscure, occult, penetrating, profound, recondite, sagacious, secret, serious, wise |
| Antonyms: | frivolous, ignorant, shallow, superficial, trivial, unintelligent |
| Main Entry: | difficult |
| Part of Speech: | adjective |
| Definition: | complicated; hard to comprehend |
| Synonyms: | abstract, abstruse, baffling, bewildering, complex, confounding, confusing, dark, deep, delicate, enigmatic, enigmatical, entangled, esoteric, formidable, hard to explain, hard to solve, hidden, inexplicable, intricate, involved, knotty, labyrinthine, loose, meandering, mysterious, mystical, mystifying, nice, obscure, obstinate, paradoxical, perplexing, problematical, profound, puzzling, rambling, subtle, tangled, thorny, ticklish, troublesome, unclear, unfathomable, unintelligible, vexing |
| Antonyms: | easy, simple, straightforward, uncomplicated |