This is the 199th most frequent Slovenian word.
eni
The Slovenian word "eni" means "some" or "certain people" in English.
Here, 'eni' is used to mean 'some', indicating a subset of people.
Eni ljudje uživajo v naravi.
Some people enjoy being in nature.
In this sentence, 'eni' again implies 'some', referring to a subset within a group 'us'.
Eni izmed nas niso šli na izlet.
Some of us did not go on the trip.
The word 'eni' would be elliptically used in this context to mean 'some' when simplified to context-specific agreement.