English Reference
adjective

decisive

adj.
US /dɪˈsaɪsɪv/ UK /dɪsˈaɪsɪv/ de·ci·sive

  1. 01 B2 Upper Intermediate

    able to make decisions quickly and with confidence.

    characterised by the ability to make firm decisions promptly and without hesitation.

    Simple

    A decisive leader is needed to guide the company through this crisis.

    In context

    The board sought a decisive chief executive who could implement the necessary reforms without succumbing to internal political pressure.

    Usage

    Usually describes a person's character or a specific action taken by a person.

  2. 02 B2 Upper Intermediate

    settling something once and for all, or providing a clear result.

    having the power to settle a dispute or determine the final outcome of a situation.

    Simple

    The team scored a decisive goal in the final minute of the game.

    In context

    The archaeological evidence provided a decisive answer to the long-standing debate regarding the city's original boundaries.

    Usage

    Often used with nouns like 'victory', 'factor', 'evidence', or 'action'.

  3. 03 C1 Advanced Formal

    very clear and easy to see; leaving no doubt.

    unmistakable or definite in nature; leaving no room for doubt or uncertainty.

    Simple

    There has been a decisive improvement in her test scores this term.

    In context

    The data showed a decisive shift in consumer behaviour following the introduction of the new environmental regulations.

    Teacher's tip

    In this sense, 'decisive' is often used in academic or professional reports to describe trends or changes.

Usage decisive action · decisive influence · decisive role

That could prove decisive in an early primary state such as South Carolina.

The Guardian· 15 Aug 2026

The prime minister, Anutin Charnvirakul, said he had ordered the interior ministry and police to stop issuing licences to possess, purchase and carry firearms, and called for “tighter controls and decisive penalties”.

The Guardian· 12 Aug 2026

From Middle French décisif, equivalent to decide + -ive.

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

This entry
Level C1 · Advanced
Frequency Frequent
Updated