Synonyms of determining

2 Syllables
certain
3 Syllables
important, life-and-death, pivotal, earthshaking, governing, earth-shaking
4 Syllables
presidential, decisive, operating, normalizing, conclusive, earthshattering, overriding, standardizing, all-important, earth-shattering, determinant
5 Syllables
gubernatorial, determinate, definitive
6 Syllables
determinative