taru-adjective, adverb taking the 'to' particle
tipsy and cheerful; merry with drink
Literary or classical expression describing a pleasant, slightly drunk state. Often used in the form 醺然として or 醺然たる. Rare in everyday speech.
彼は酒に酔って醺然としていた。
He was tipsy and cheerful from the sake.
醺然たる気分で、彼は歌い始めた。
In a merry drunken mood, he began to sing.