adj. 25B6; adjective
a lucid description : INTELLIGIBLE, comprehensible, understandable, cogent, coherent, articulate; clear, transparent; plain, simple, vivid, sharp, straightforward, unambiguous, graphic; formal perspicuous.
he was not lucid enough to explain : RATIONAL, sane, in one's right mind, in possession of one's faculties, compos mentis, able to think clearly, balanced, clear-headed, sober, sensible; informal all there.
confusing, confused.