English Reference
adverb

indefinitely

adv.
US /ˌɪnˈdɛfənətɫi/ UK /ɪndˈɛfɪnətli/ in·def·i·nite·ly

  1. 01 B2 Upper Intermediate

    for a long time, or forever, without a planned date to stop.

    for an unlimited or unspecified period of time; without a predetermined conclusion.

    Simple

    The local library is closed indefinitely while they repair the roof.

    In context

    The negotiations have been postponed indefinitely, as neither side is currently willing to make the necessary concessions to return to the table.

    Usage

    usually follows the verb it modifies or appears at the end of the clause.

    Teacher's tip

    Learners often confuse this with 'forever'. While it can mean forever, it more often implies that the end date simply hasn't been decided yet.

  2. 02 C1 Advanced Formal

    in a way that is not clear or exact.

    in a vague, imprecise, or ill-defined manner.

    Simple

    He spoke indefinitely about his plans, so I still don't know what he wants to do.

    In context

    The report was phrased so indefinitely that it was impossible to determine who was actually responsible for the error.

    Usage

    often modifies verbs of speaking or describing.

    Teacher's tip

    This sense is much rarer than the temporal one; in modern English, 'vaguely' is almost always preferred.

    vaguelyimpreciselyunclearly

Yet people often assume green roofs will continue working indefinitely after installation without stopping to consider the work involved in keeping them alive.

Phys.org· 14 Aug 2026

Starting at this moment and indefinitely, classes are suspended in all educational institutions,” said Mauricio Salazar .

The Guardian· 11 Aug 2026

From indefinite + -ly.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated