decisive
de-ci-sive
adjective
Settling an issue or producing a clear, definite result.
"The goal proved decisive in the championship match."
adjective
Having or showing the ability to make quick, effective decisions.
"She is a decisive leader, always acting swiftly."
Thesaurus
Synonyms: unhesitating, resolute, definite, determining, fatal, determinant, determinative, peremptory, fateful, deciding, crucial, critical
Antonyms: indecisive