How to say "lucid" in Japanese

• 明快めいかいCommon
  na-adjective, nounCovers the sense of 'lucid' as in clear, easily followed explanation, argument, or writing. It stresses clarity and lack of ambiguity, so it suits lucid reasoning or exposition rather than perception.
• 明澄めいちょう
  na-adjective, nounDescribes lucidity as transparency or limpid clarity, of things like water or air, and by extension of a lucid mind or expression. It is a less common word for this sense.
• 透徹したとうてつした
  prenominal modifierCovers 'lucid' in the sense of penetrating clarity of thought or insight, seeing through to the essence of things. It is less common and emphasizes depth of perception as much as clarity.

Use 明快 for clear, lucid exposition or argument; 明澄 and 「透徹した」 both describe lucidity of mind or perception, with 「透徹した」 adding a penetrating quality; the latter two are less common.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 明快めいかいclear
• 明澄めいちょうlucid
• 透徹したとうてつしたclear