Synonyms of significantly

3 Syllables
pressingly, perforce, somewhat, vitally, bearably
4 Syllables
cardinally, exigently, willy-nilly, undoubtedly, accordingly, naturally, consequently, essentially
5 Syllables
inescapably, compulsorily, ineluctably, irresistibly, unpreventably, unquestionably, indubitably, positively, necessarily, fundamentally, inexorably
6 Syllables
determinately, axiomatically, incontrovertibly, automatically