単たん純じゅん明めい快かいConjugationsMeaningsNounNa-adjective1. simple and clear; plain and simple (Yojijukugo)Kanji used単single純pure明bright快pleasantComposed of単たん純じゅんsimple; plain; uncomplicated; straightforward; simple-minded; naiveNa-adjective明めい快かいclear; clear-cut; lucid; unequivocal; explicitNa-adjective