How to Say "stranger" in Spanish
The most common Spanish word for “stranger” is “desconocido” — use this when referring to a person who is completely unknown to you, emphasizing their anonymity.
desconocido
des-koh-noh-SEE-dohdes.ko.noˈsi.ðo

Examples
Un desconocido llamó a la puerta y preguntó por ti.
A stranger knocked on the door and asked for you.
La desconocida dejó un mensaje antes de irse.
The unknown woman left a message before leaving.
Prefiero no hablar con desconocidos en la calle.
I prefer not to talk to strangers on the street.
The Noun Form
When used as a noun, 'desconocido' acts like a person: 'el desconocido' (the male stranger) or 'la desconocida' (the female stranger). You must use the matching article (el/la) and pluralize (los/las desconocidos/as).
extraño
Examples
Un extraño me preguntó la hora en la calle.
A stranger asked me for the time on the street.
forastero
fo-ras-TEH-rofoɾasˈteɾo

Examples
En este pueblo pequeño, todos saben quién es el forastero.
In this small town, everyone knows who the stranger is.
El forastero pidió una habitación en la posada.
The outsider asked for a room at the inn.
No solemos ver a muchos forasteros por estos caminos.
We don't usually see many newcomers on these roads.
Describing People
This word is a 'naming word' (noun) that points to a man. If you want to talk about a woman, you change the 'o' to an 'a' (forastera).
Town vs. Country
Use this word when someone is from a different town or region, not necessarily a different country.
Forastero vs. Extranjero
Mistake: “Using 'extranjero' to describe someone from the next village over.”
Correction: Use 'forastero' for someone from another town; 'extranjero' is strictly for someone from another country.
extranjero
ehx-trahn-HEH-roheks.tɾaŋˈxe.ɾo

Examples
El extranjero tuvo que mostrar su visa en la aduana.
The foreigner had to show his visa at customs.
Conocí a una extranjera muy amable en el tren.
I met a very kind foreigner (female) on the train.
Gender Changes for People
When referring to a person, you must change the ending to 'extranjera' for a woman, and 'extranjero' for a man.
Confusing 'Foreign' with 'Strange'
Mistake: “Esa persona es muy extraña.”
Correction: Esa persona es muy extranjera. (If you mean she is from another country. 'Extraña' means strange or weird.)
Desconocido vs. Extraño
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