へいたん 平坦 LinksSentence search for 平坦Sentence search for へいたんKanji details for 平 and 坦Edit in JMdict Na-adjective (keiyodoshi), Noun1. even; flat; level; smoothNa-adjective (keiyodoshi), Noun2. calm; peaceful; uneventful; easy; uncomplicated; trouble-freeへいわ平和へのみち道はけっ決してへいたん平坦ではない。The road to peace is never smooth. Discussions Log in to talk about this word.