How to Say "alone" in Spanish
The Spanish word for “alone” is “solo” — A1 level. This is a very common word in everyday Spanish.

Examples
Mi hermano vive solo en un apartamento pequeño.
My brother lives alone in a small apartment.
A veces me siento un poco sola por las noches.
Sometimes I feel a little lonely at night.
Quiero un café solo, sin leche ni azúcar.
I want a single coffee (a black coffee), without milk or sugar.
A Word with Four Forms
This 'solo' is a describing word, so it must match the person or thing it's describing. It can change to 'sola' (for feminine things), 'solos' (for plural masculine things), or 'solas' (for plural feminine things).
Forgetting to Match
Mistake: “La mujer está solo.”
Correction: La mujer está sola. Because 'mujer' is feminine, the describing word needs to end in '-a'.
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