decisive

[dih-sahy-siv]
adjective
1.
having the power or quality of deciding; putting an end to controversy; crucial or most important: Your argument was the decisive one.
2.
characterized by or displaying no or little hesitation; resolute; determined: The general was known for his decisive manner.
3.
indisputable; definite: a decisive defeat.
4.
unsurpassable; commanding: a decisive lead in the voting.

Origin:
1605–15; < Medieval Latin dēcīsīvus, equivalent to Latin dēcīs(us) (see decision) + -īvus -ive

decisively, adverb
decisiveness, noun
nondecisive, adjective
nondecisively, adverb
nondecisiveness, noun
predecisive, adjective
predecisively, adverb


1. conclusive, final. 2. firm.
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World English Dictionary
decisive (dɪˈsaɪsɪv)
 
adj
1.  influential; conclusive: a decisive argument
2.  characterized by the ability to make decisions, esp quickly; resolute
 
de'cisively
 
adv
 
de'cisiveness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

decisive
1610s, see decide + -ive.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
All of the former's grim predictions had been decisively overturned by events.
One cannot still cite the conclusions of that trial as valid, when those
  conclusions have now been decisively overturned.
Weapons were decisively advanced by the nineteenth century, but the balance of
  power had shifted in the eighteenth.
It will not ease its macroeconomic controls until inflation falls more
  decisively.
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