- 1 very important for the final result of a particular situation a decisive factor/victory/battle/action Climate was a decisive factor in establishing where the tournament should be held. She has played a decisive role in the peace negotiations. a decisive step (= an important action that will change a situation) toward a cleaner environment Thesaurusessentialvital crucial critical decisive indispensableThese words all describe someone or something that is extremely important and completely necessary because a particular situation or activity depends on them.essential extremely important and completely necessary, because without it something cannot exist, be made, or be successful:Experience is essential for this job.vital essential:The police play a vital role in our society.essential or vital?These words have the same meaning but there can be a slight difference in tone. Essential is used to state a fact or an opinion with authority. Vital is often used when there is some anxiety felt about something, or a need to persuade someone that a fact or an opinion is true, right, or important. Vital is less often used in negative statements:It was vital to show that he was not afraid. Money is not vital to happiness.crucial extremely important because a particular situation or activity depends on it:It is crucial that we get this right.critical extremely important because a particular situation or activity depends on it:Your decision is critical to our future.crucial or critical?These words have the same meaning but there can be a slight difference in context. Critical is often used in technical matters of business or science;crucial is often used to talk about matters that may cause anxiety or other emotions.decisive of the greatest importance in affecting the final result of a particular situation:She played a decisive role in the peace negotiations.indispensable essential; too important to be without:This database has become an indispensable resource in our research.Patterns essential/vital/crucial/critical/decisive/indispensable for something essential/vital/crucial/critical/indispensable to something essential/vital/crucial/critical that… essential/vital/crucial/critical to do something a(n) essential/vital/crucial/critical/decisive/indispensable part/role/factor of vital/crucial/critical/decisive >importance> absolutely essential/vital/crucial/critical/decisive/indispensable
- 2able to decide something quickly and with confidence decisive management The government must take decisive action on gun control. opposite indecisive Word Familydecide verbdecision noun (≠indecision)decisive adjective (≠indecisive)undecided adjective
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adverb She shook her head decisively.