The fact of breaking a promise to your partner — having sex with, or a romance with, someone who is not your husband, wife, or partner. It is a noun, so it names the thing itself rather than the person: "her unfaithfulness," "years of unfaithfulness." This is the quiet, formal word for it.

the fact of breaking a promise to your partner違背對伴侶的承諾這件事 — having sex with, or a romance with跟...發生性關係，或談戀愛 someone who is not your husband, wife, or partner不是你丈夫、妻子或伴侶的人. it它 is a noun是名詞, so所以 it names the thing itself rather than the person指的是這件事本身，而不是那個人: "her unfaithfulness,"『her unfaithfulness』, "years of unfaithfulness."『years of unfaithfulness』. this這 is the quiet, formal word for it是比較文靜、正式的講法.

In real conversation people say "cheating," and that is by far the most common word: "his cheating," "she found out about the cheating." Unfaithfulness belongs to writing and to careful, gentle speech — a counsellor, a priest, a lawyer, someone trying not to sound harsh.

in real conversation在真實對話裡, people人們 say會說 "cheating,"『cheating』, and而且 that is by far the most common word這是目前為止最常見的字: "his cheating,"『his cheating』, "she found out about the cheating."『she found out about the cheating』. unfaithfulnessunfaithfulness belongs to writing and to careful, gentle speech則屬於書面文字，或是小心、溫和的說話場合 — a counsellor, a priest, a lawyer像是諮商師、神父、律師, someone trying not to sound harsh或是想避免說得太刺耳的人.

There is a related word, infidelity, which is even more formal and appears more often in newspapers than unfaithfulness does. And adultery is the legal and religious word, narrower: it usually needs a marriage. Unfaithfulness is the broadest and softest of the four.

there is a related word有一個相關的字, infidelityinfidelity, which比unfaithfulness is even more formal更正式 and而且 appears more often in newspapers than unfaithfulness does出現在報紙上的次數也更多. and而 adulteryadultery is the legal and religious word是法律和宗教用的字, narrower範圍比較窄: it它 usually needs a marriage通常要有婚姻關係才算. unfaithfulnessunfaithfulness is the broadest and softest of the four是這四個字裡最寬泛、最柔和的一個.

Like unfaithfully, it also has an older, wider use — being unfaithful to a job, a friend, a country, a promise of any kind — but today most people hear it and think of love.

like unfaithfully就像unfaithfully一樣, it它 also has an older, wider use也有一種比較老、比較廣的用法 — being unfaithful to a job, a friend, a country, a promise of any kind對工作不忠、對朋友不忠、對國家不忠、對任何一種承諾不忠 — but但 today現在 most people大多數人 hear it聽到它 and想到的都是 think of love感情.