This is the 6837th most frequent Polish word.
foreign
The Polish word for "foreign" is "obcy," meaning something from or relating to another country or unfamiliar.
Here 'foreign' refers to languages that are not native to the speaker's context or environment.
Lubię uczyć się języków obcych.
I like learning foreign languages.
In this sentence, 'foreign' pertains to countries outside of the speaker's nation.
Zagraniczne kraje mają interesującą kulturę.
Foreign countries have interesting cultures.
Here, 'foreign' describes a person who is from a different country.