Lucid1. (n.) Clear; mentally sound; as, a lucid thought process.
2. (n.) Shining; bright; resplendent; as, the lucid orbs of heaven.
3. (n.) Presenting a clear view; easily understood; clear.
4. (n.) Bright with the radiance of intellect; not darkened or confused by delirium or madness; marked by the regular operations of reason; as, a lucid interval.
Thesaurus Entries
Attic, Ciceronian, all there, apprehensible, balanced, beaming, bright, brilliant, chaste, classic, clean-cut, clear, clear as crystal, clear as day, clear-cut, clearheaded, clearminded, cloudless, coherent, compos mentis, comprehensible, connected, consistent, crisp, crystal, crystal-clear, crystalline, defined, definite, diaphane, diaphanous, direct, distinct, easy, effulgent, elegant, explicit, express, fathomable, filmy, finished, gauzy, gossamer, gossamery, graceful, gracile, graspable, healthy-minded, incandescent, intelligible, knowable, lambent, light, light-pervious, lightish, lightsome, limpid, loud and clear, lucent, luculent, luminous, lustrous, mentally sound, natural, neat, nonopaque, normal, of sound mind, peekaboo, pellucid, perspicuous, plain, polished, pure, radiant, rational, reasonable, refined, refulgent, relucent, restrained, revealing, right, round, sane, sane-minded, see-through, semipellucid, semitranslucent, sensible, serene, sheer, simple, sound, sound-minded, straightforward, tasteful, terse, thin, together, translucent, translucid, transparent, transpicuous, trim, unaffected, unambiguous, unclouded, unconfused, unequivocal, univocal, unlabored, unmistakable, unobscured, well-defined, wholesome