プログレッシブ和英中辞典(第4版)の解説
うわき【浮気】
❶〔移り気〕capriciousness
浮気な inconstant; capricious
彼は浮気で一つのことをすぐにやめて新しいことをやる
He is so change-able_he never sticks to one thing very long before moving on to something new.
❷〔異性に対する移り気〕a flirtation；〔結婚相手以外との性的関係〕an (extramarital) affair
浮気な 〔恋をもてあそぶ〕flirtatious；〔移り気な〕fickle
浮気する have an affair ((with))
夫の浮気のために離婚した
She divorced her husband because he was unfaithful to her.
彼は決して浮気はしない
He is entirely faithful to his wife.／He doesn't play around with other women at all.
浮気な女
a fickle woman
浮気な男
a man with a roving eye／a womanizer
浮気者
〔女〕a flirt；〔男〕a playboy，((やや文)) a philanderer