Will the universe expand indefinitely?

Our manager agreed to let us work from home indefinitely with the proviso that we attend monthly meetings in person.

Love is mystery and misery indefinitely.

The union went out on a strike for an indefinite period.

The Regency Hotel was closed indefinitely.

Sami was on indefinite sick leave.

The road is closed indefinitely.

In English, the words a or an are indefinite articles that are used to refer to a person or thing that is non-specific, such as something generic or something mentioned for the first time.

The game has been indefinitely postponed.

Any truth is better than indefinite doubt.