I'm a teacher and was doing articles with my students. This sentence, however, really got me stuck!

We are entering (an) uncertain future.

Why an indefinite article here? At first, I thought it was because future wasn't countable, but of course, it is. Then, I wondered if was an abstract concept. Is it because it's a non-defined/non-specific future i.e., one of 'any' futures, which is uncertain? Any suggestions welcome!

Thanks, An English teacher.

I'm a teacher and was doing articles with my students. This sentence, however, really got me stuck!

We are entering [an] uncertain future.

Why is there an indefinite article here? At first, I thought it was because future wasn't countable, but of course, it is. Then, I wondered if it was an abstract concept. Is it because it's a non-defined/non-specific future i.e., one of 'any' futures, which is uncertain?