lucid

1 giving off or reflecting much light those lucid bands that spread across the arctic sky and are known as the northern lights Synonyms beaming, bedazzling, brilliant, candescent, clear, dazzling, effulgent, fulgent, glowing, incandescent, lambent, lucent, bright, luminous, lustrous, radiant, refulgent, sheeny, shining, shiny, splendidRelated Words ablaze, ardent, blazing, burning, combusting, fiery, flaming, red-hot; agleam, aglitter, blinding, coruscant, flaring, flashing, flickering, gemmy, glancing, glaring, gleaming, glimmering, glinting, glistening, glistering, glittering, scintillant, scintillating, shimmering, shimmery, sparkling, sunny, twinkling, winking; burnished, polished, shined; superbright, ultrabrightNear Antonyms blackened, dark, darkened, darkish, darkling, darksome, dimmed, dusky, gloomy, lightless, murky, obscure, obscured, pitch-black, pitch-dark, somber (or sombre), sunless, tenebrous, unlit; cloudy, shadowlike, shadowy, shady; gray (also grey), leaden, pale, palishAntonyms dim, dull, lackluster, unbright, unbrilliant

2 having full use of one's mind and control over one's actions decided to make out her will while she was still lucid Synonyms balanced, clearheaded, compos mentis, sane, normal, right, stableRelated Words analytic (or analytical), clear, coherent, logical, rational, reasonable; even-keeled, judicious, levelheaded, sensible, wise; healthy, sound, unneurotic; well-adjusted, well-balancedNear Antonyms balmy, bananas, batty, bughouse [slang], certifiable, crackbrained, cracked, crackpot, cranky [dialect], cuckoo, daffy, daft, dotty, fruity [slang], gaga, loco [slang], loony (also looney), loopy, meshuga (or meshugge also meshugah or meshuggah), moonstruck, nuts, nutty, scatty [chiefly British], screwy, wacko (also whacko), wacky (also whacky); aberrant, delirious, disordered; delusional, delusionary, disturbed, neurotic, obsessive-compulsive, paranoiac (also paranoic), paranoid (also paranoidal), psycho, psychotic, schizo, schizoid, schizophrenic, schizy (or schizzy); eccentric, odd, oddball, off, pixilated (also pixillated), potty [chiefly British], queer, strange; foolish, senseless, witless; irrational, mixed-up, unreasonable; depressed, despondent; distracted, distraught, frantic, frenzied, haywire, hysterical (also hysteric), raving, wigged-out; amok (or amuck), ape, ballistic, berserk, nuclear; fixated, monomaniac, monomaniacal, obsessedAntonyms brainsick, crazed, crazy, demented, deranged, insane, lunatic, mad, maniacal (also maniac), mental, unbalanced, unsound

3 not subject to misinterpretation or more than one interpretation tried to make his instructions as lucid as possible so that everyone would understand what to do Synonyms apparent, bald, bald-faced, barefaced, bright-line, broad, clear-cut, crystal clear, decided, distinct, evident, clear, luculent, luminous, manifest, nonambiguous, obvious, open-and-shut, palpable, patent, pellucid, perspicuous, plain, ringing, straightforward, transparent, unambiguous, unambivalent, unequivocal, unmistakableRelated Words cognizable, cognoscible, comprehendible, comprehensible, digestible, fathomable, graspable, intelligible, knowable, understandable; self-evident, self-explanatory; clean-cut, simple, tidy, uncomplicated; overt, undisguised; appreciable, perceptible, recognizable, sensible, tangible; discernible (also discernable), noticeable, observable, visible; black-and-white, explicit, trenchant, well-defined; clean, decipherable, fair, legible, readableNear Antonyms incomprehensible, indecipherable, unfathomable, unintelligible, unknowable; impalpable, imperceptible, inappreciable, indiscernible, insensible; cloudy, gauzy, gray (also grey), hazy, imprecise, indefinite, indeterminate, misty, murky, nebulous, noncommital, sketchy, slippery, subtle, vague; illegible, undecipherable, unreadableAntonyms ambiguous, clouded, cryptic, dark, enigmatic (also enigmatical), equivocal, indistinct, mysterious, nonobvious, obfuscated, obscure, unapparent, unclarified, unclear, unclouded