This is the 12861st most frequent Polish word.
obcym
"Obcym" means "foreign" or "alien" in English.
The word 'obcym' pertains to 'foreign' or 'unknown', here describing people unfamiliar to the speaker.
Nie ufam obcym ludziom.
I don't trust strangers.
'Obcym' refers to something not familiar or native; in this case, a language unfamiliar to the speaker.
Ten język jest mi całkowicie obcym.
This language is completely foreign to me.
Here, 'obcych' (the plural form) describes countries that are unfamiliar or distant to the speaker.