luculent
     adj : (of language) transparently clear; easily understandable;
           "writes in a limpid style"; "lucid directions"; "a
           luculent oration"- Robert Burton; "pellucid prose"; "a
           crystal clear explanation"; "a perspicuous argument"
           [syn: {limpid}, {lucid}, {pellucid}, {crystal clear}, {perspicuous}]
Source: WordNet® 2.0