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フレネミー furenemii
The friend who is also the problem.
What does furenemii mean?
A katakana borrowing of the English frenemy, friend plus enemy: the one who smiles at lunch and undercuts you afterwards. Calling somebody this is an accusation, so it usually describes a dynamic rather than a person to their face.
Example
あの三人、仲良く見えてけっこうフレネミーだよね。
Those three look close, but there's a lot of frenemy in that group.
Vibe
Who you can say this to, and how it lands.
Be careful This one carries weight. Read the meaning and the story before you say it to anyone.
Aimed at another person, this is an insult.
Culture note
In Japan the word settled into relationship talk rather than insult-throwing: the office, the group chat, the friend circle where everyone has quietly noticed the same person.
The story behind furenemii
English speakers already own this word, which makes フレネミー a neat lesson in what borrowing actually does. The compound crossed over during the 2010s through women's magazines and daytime television, and it arrived with a house format attached: フレネミー女子, a recognisable type with a list of behaviours, rather than a clever one-off insult.
That framing stuck. In Japanese the word is closer to a diagnosis than an attack. People reach for it to name a shape they are caught inside, usually at work or in a long friendship that is expensive to leave, so the interesting half of any フレネミー conversation turns out to be why the relationship continues. Compare 八方美人, who pleases everyone without necessarily undermining anyone.