English Reference
adverb

unbelievably

adv.
US /ˌənbəˈɫivəbɫi/ UK /ʌnbɪlˈiːvəbli/ un·be·liev·ably

  1. 01 B2 Upper Intermediate

    used to emphasize that something is very extreme or much more than expected.

    used as an intensifier to emphasize an extreme degree, often synonymous with 'incredibly' or 'extremely'.

    Simple

    The weather was unbelievably hot for this time of year.

    In context

    The logistics of the operation were unbelievably complex, requiring coordination across three different time zones and four government agencies.

    Usage

    Usually placed before an adjective or another adverb to add emphasis.

    Teacher's tip

    In casual conversation, this is often used as a hyperbolic synonym for 'very'.

  2. 02 C1 Advanced Formal

    in a way that is impossible or very difficult to believe is true.

    in a manner that exceeds the limits of belief or credibility.

    Simple

    He spoke unbelievably about his adventures in the jungle.

    In context

    The witness recounted the events so unbelievably that the jury began to doubt the core of his testimony.

    Usage

    Often modifies a verb related to speaking, acting, or occurring.

    Teacher's tip

    This sense is less common than the intensifying sense; it focuses on the lack of credibility rather than just high intensity.

    implausiblyincredibly
    believablyplausibly
  3. 03 B2 Upper Intermediate

    used to say that something is very surprising or amazing because it was not expected.

    contrary to expectations; used to introduce a statement that is remarkably surprising.

    Simple

    Unbelievably, the cat found its way home after being lost for a month.

    In context

    Unbelievably, the small startup managed to outperform its multi-billion dollar competitors within the first fiscal year.

    Usage

    Often used as a sentence adverb at the beginning of a clause to set the tone.

    Teacher's tip

    When used at the start of a sentence, it functions similarly to 'surprisingly' but with much stronger emotional weight.

It’s my wife, my ex-wife – I love her unbelievably, but we lost the passion.

The Guardian· 18 Aug 2026
This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated