How to Say "other people's" in Spanish
The Spanish word for “other people's” is “ajeno” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
adjectiveB1
feelings or business

Examples
No debes tomar lo ajeno.
You shouldn't take what belongs to others.
No me gusta meterme en asuntos ajenos.
I don't like to get involved in other people's business.
Ese problema es ajeno a nuestra empresa.
That problem is foreign to (unrelated to) our company.
Matching the Noun
Since this is a describing word, it must match what it describes. Use 'ajeno' for masculine items and 'ajena' for feminine items (e.g., 'el coche ajeno' vs 'la casa ajena').
Using 'de otros' every time
Mistake: “Es el libro de otros.”
Correction: Es un libro ajeno.
Related Translations
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