浮気

Etymology
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Compound of. The use of is an example of.

Adjective

 * 1) fickle, unfaithful, disloyal
 * 2) cheerful and showy; capricious

Noun

 * 1) extramarital sex, affair, fooling around
 * 2) unfaithfulness, infidelity
 * 3) capriciousness

Verb

 * 1) to have an affair
 * 2) to be unfaithful, to cheat, to adulterate