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When referring to things, decided means unquestionable; and when referring to people, it means free from doubt, and thus resolute or determined.
In contrast, decisive refers to quick, efficient decision making and to people capable of making such decisions.
Decisive also conveys the idea that something is conclusive, as in a decisive advantage, a decisive event or moment, or a decisive victory.
In general, decidedly is a synonym for undoubtedly or definitely.
Decisively is an equivalent for resolutely.
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