天てん然ねんにMeanings1adverbnaturally; spontaneouslyDescribes something happening without external force or artificial intervention, in a natural or spontaneous manner.彼かれの才さい能のうは天てん然ねんに開かい花かした。His talent blossomed naturally.そのアイデアは天てん然ねんに浮うかんだ。The idea came to me spontaneously.