conclusive, decisive, determinative, definitive mean bringing to an end. conclusive applies to reasoning or logical proof that puts an end to debate or questioning.

DECISIVE definition: 1. able to make decisions quickly and confidently, or showing this quality: 2. strongly affecting…. Learn more.

Jan 11, 2026 · decisive (comparative more decisive, superlative most decisive) Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.

Factsheet What does the word decisive mean? There are five meanings listed in OED's entry for the word decisive. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

DECISIVE definition: having the power or quality of deciding; putting an end to controversy; crucial or most important. See examples of decisive used in a sentence.

de•ci•sive /dɪˈsaɪsɪv/ adj. having the power to decide: The decisive argument was the savings his plan would bring. displaying firmness; resolute: a decisive manner. unquestionable; definite: a decisive …

If someone is decisive, they have or show an ability to make quick decisions in a difficult or complicated situation. He should give way to a more imaginative, more decisive leader.

The word "decisive" is correct and usable in written English. You can use it to describe a person or thing that is forceful, determined, and makes decisions quickly.

The largest and most trusted free online dictionary for learners of British and American English with definitions, pictures, example sentences, synonyms, antonyms, word origins, audio pronunciation, …

Some common synonyms of decisive are conclusive, definitive, and determinative. While all these words mean "bringing to an end," decisive may apply to something that ends a controversy, a contest, or …