Synonyms of importantly

2 Syllables
mostly, chiefly
3 Syllables
largely, vitally, notably
4 Syllables
especially, materially, cardinally, superiorly, eminently, preeminently, supremely, dominantly, prevailingly, prevalently, essentially, primarily, basically, substantially, generally, principally, peculiarly
5 Syllables
fundamentally, predominantly, universally, particularly
6 Syllables
determinately, superlatively