1. (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.

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