浮つく

うわつく【浮つく】

become fickle [frivolous]; become restless [fidgety].

●浮ついた flippant; fickle; frivolous

・浮ついている be fickle; be flippant; be restless; be unsettled; be giddy.

●彼は成功に酔って浮ついている. Success has turned his head.

・彼女には浮ついた話の一つもない. I've never heard anyone suggest that she's frivolous.

・そんな浮ついた気持ちでいるからいつも失敗するんだ. That frivolous attitude of yours is what always causes things to go wrong for you.