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A frenemy is someone you stay friendly with on the outside, but who is really against you, or is trying to beat you at the same thing. You might chat, smile, and even go out in the same group, yet you do not fully trust them. People use it about school, work, and famous people. It is an informal talking word, not for a serious letter. Though actually, it is not always a deep enemy. Sometimes it is a friend you also compete with, and the warm and cold feelings can take turns.
友敵（口語；日常更常說「亦敵亦友」）
組成A blend of friend + enemy: the front of friend and the back of enemy. Writers made it more than once. By 1952 some already used it as a normal word; decades later others still treated it as a one-off joke. Now it is widely known.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
frenemynoun/ˈfɹɛ.nɪ.mi/
- 1
Someone who has traits of an enemy and a friend.
- Painting with a bland stroke, hardly mixing color on palette or canvas, working neatly, quickly, deftly, and a bit hygienically—like an Old World gentleman—over his “spontaneous” projects—indeed, “tickling” his way along, to borrow frenemy Picasso's devastating verb—he [Henri Matisse] seems never to be deeply involved or even slightly carried away by his work.
- Another enemy / Not even a frenemy.
- 2
A fair-weather friend who is also a rival.
- So, we're definitely not going to be friends with Ferguson? Maybe we can be frenemies. A love-hate relationship's the next best thing.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。