DECISIVELY
decisively
(adverb) in an indisputable degree; “the Fisher Act of 1918 decisively raised their status and pay”
decisively
(adverb) with finality; conclusively; “the voted settled the argument decisively”
decisively, resolutely
(adverb) with firmness; “‘I will come along,’ she said decisively”
Source: WordNet® 3.1
Etymology
Adverb
decisively (comparative more decisively, superlative most decisively)
In a decisive manner.
Source: Wiktionary
DECISIVE
De*ci*sive, a. Etym: [Cf. F. décisif. See Decision.]
1. Having the power or quality of deciding a question or controversy;
putting an end to contest or controversy; final; conclusive. "A
decisive, irrevocable doom." Bates. "Decisive campaign." Macaulay.
"Decisive proof." Hallam.
2. Marked by promptness and decision.
A noble instance of this attribute of the decisive character. J.
Foster.
Syn.
– Decided; positive; conclusive. See Decided.
– De*ci"sive*ly, adv.
– De*ci"sive*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition