てんねん 天然 Common word JLPT N3 LinksSentence search for 天然Sentence search for てんねんKanji details for 天 and 然Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. nature; spontaneityAntonym: 人工このくるま車はてんねん天然ガスでうご動く。This car runs on natural gas.Noun, Noun which may take the genitive case particle 'no'2. natural airheadAbbreviation, Colloquial, See also 天然ボケ Discussions Log in to talk about this word.