decisively

decisively — adverb

1. acting with the ability to make choices quickly and carry them out confidently,

1.adverbB2
Definition

acting with the ability to make choices quickly and carry them out confidently, without hesitating or doubting yourself

Example

Adaeze acted decisively, calling for help before the fire could spread further.

act decisively + -ing clause showing follow-up action

The CEO responded decisively to the crisis, cutting prices and reassuring customers within hours.

respond decisively to [situation]

Common collocations
  • act decisively
  • respond decisively
  • move decisively
  • decide decisively
  • nod decisively
Synonyms
  • resolutely

    stronger emphasis on unwavering determination, less on speed

  • firmly

    focuses on strength of action, less on quickness

  • conclusively

    emphasises bringing something to an end, not the manner of acting

Antonyms

Grammar Patterns

act decisively

respond decisively

decisively + action verb

Usage Note

Frequently pairs with action verbs such as act, respond, move, and decide. The adverb emphasises both speed and firmness of the action.

Common Mistakes

She decisively thought about it for a week.
She thought about it for a week and then acted decisively.
Decisively describes confident action, not the thinking process itself.

2. used when something has a very strong and clear effect on what finally happens i

2.adverbB2
Definition

used when something has a very strong and clear effect on what finally happens in a situation, often determining the result

Example

Owen's late goal decisively turned the match in his team's favour.

decisively + turned [outcome]

The new DNA report decisively proved that Andrei was not at the scene of the crime.

decisively proved [fact] — common pattern with evidence

Common collocations
  • decisively prove
  • decisively shift
  • decisively turn
  • decisively affect
  • decisively influence
Synonyms
  • conclusively

    emphasises settling a question beyond doubt, more final

  • definitively

    suggests an authoritative, final resolution

  • critically

    focuses on importance or urgency rather than outcome-shaping

Antonyms
  • marginally

    having only a small effect that does not determine the outcome

  • insignificantly

    having no meaningful impact on results

Grammar Patterns

decisively + verb of change/proof

decisively affect [outcome]

Usage Note

Common with verbs of proving, changing, or determining (prove, shift, turn, affect, influence). Often appears in formal or analytical writing about causes and results.

Common Mistakes

The weather decisively changed.
The weather decisively affected the outcome of the race.
Decisively (sense 2) requires an effect on a specific result or situation; a simple change is not enough.

Word family

Synonym discussion

Sense: adverb/1

All four describe doing something with strength and certainty, but they differ in what aspect they highlight. Decisively focuses on making a clear choice and acting on it without delay — it combines speed with confidence. Resolutely emphasises unwavering determination over time, even when facing difficulty (e.g. 'The team resolutely refused to give up'). Firmly stresses the strength or steadiness of an action or belief, without necessarily implying speed (e.g. 'She firmly stated her position'). Emphatically is about the force of expression — doing or saying something in a way that leaves no doubt about your feelings ('He emphatically denied the accusation'). For choosing an example: 'She decisively picked the cheaper option and paid immediately' shows quick confident action, while 'She firmly told them her decision' shows strength of conviction without the speed element.

decisively ↗resolutely ↗firmly ↗emphatically

Common collocations

Phrases

  • act decisively
  • respond decisively
  • move decisively
  • decide decisively
  • decisively prove
  • decisively shift
  • decisively turn
  • decisively affect

Etymology

LatinFrenchEnglish

Formed in English by adding the adverb suffix -ly to decisive, which came from Latin decisivus (meaning 'having the power to decide'). Decisivus itself comes from the Latin verb decidere, meaning 'to cut off' or 'to decide' — from de- (off) + caedere (to cut). The cutting metaphor suggests a decision 'cuts off' other possibilities.