adj.

1. Having the power to decide; conclusive.
2. Characterized by decision and firmness; resolute.
3. Beyond doubt; unmistakable: a decisive defeat.

decisively de·ci'sive·ly adv.
decisiveness de·ci'sive·ness n.

SYNONYMS  decisive, conclusive, crucial, definitive, determinative. These adjectives mean determining or having the power to determine an outcome: the decisive vote; a conclusive reason; crucial experiments; a definitive verdict; the determinative battle.
ANTONYM  indecisive

adjective

1. Determining or having the power to determine an outcome: conclusive, crucial, deciding, determinative. See decide/hesitate, important/unimportant.
2. Serving the function of deciding or settling with finality: authoritative, conclusive, definitive, determinative, final. See decide/hesitate.
3. Not hesitating or wavering: decided, determined, firm, resolute. See decide/hesitate.

adj

Definition: definite
Antonyms: indecisive, indefinite, procrastinating, unpositive

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IN BRIEF: Picking an option finally and completely. Also: showing firmness.

It's better to be boldly decisive and risk being wrong than to agonize at length and be right too late. — Marilyn Moats Kennedy.

Dansk (Danish)
adj. - afgørende, resolut

Nederlands (Dutch)
beslissend, besluitvaardig, zelfverzekerd

Français (French)
adj. - décisif, concluant, décidé, catégorique

Deutsch (German)
adj. - ausschlaggebend, entscheidend, entschlußfreudig

Ελληνική (Greek)
adj. - αποφασιστικός, κρίσιμος

Italiano (Italian)
decisivo, risoluto, deciso

Português (Portuguese)
adj. - decisivo

Русский (Russian)
решающий, решительный

Español (Spanish)
adj. - decisivo, concluyente, tajante, categórico, firme, terminante

Svenska (Swedish)
adj. - avgörande, avgjord, beslutsam

中文（简体） (Chinese (Simplified))
决定性的, 果断的, 坚定的

中文（繁體） (Chinese (Traditional))
adj. - 決定性的, 果斷的, 堅定的

한국어 (Korean)
adj. - 확실한, 비중 있는 , 결단성 있는

日本語 (Japanese)
adj. - 決定的な, 断固とした, 疑いの余地のない

العربيه (Arabic)
‏(صفه) فاصل, حاسم, قاطع‏

עברית (Hebrew)
adj. - ‮מכריע, פסקני, מוחלט‬

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