Free from ambiguity or uncertainty; unmistakable; unquestionable: as, a decided improvement.Resolute; determined; free from hesitation or wavering: as, a decided character.Synonyms Decided, Decisive, indisputable, undeniable, certain, positive, absolute. Decided and decisive are sometimes confounded, but are distinct, decided being passive and decisive active. A decided victory is a real, unmistakable victory; a decisive victory is one that decides the issue of the campaign. The battle of Bull Run ended in a decided victory, but not a decisive one; the victory at Waterloo was both decided and decisive. Compare a decided answer with a decisive one. The difference is the same as between definite and definitive. See definite.Unhesitating.