Synonyms of mainly

2 Syllables
broadly, mostly, chiefly
3 Syllables
copiously, usually, largely, overall
4 Syllables
especially, liberally, routinely, habitually, typically, commodiously, essentially, primarily, prodigiously, imposingly, substantially, prodigally, generally, principally
5 Syllables
unaccountably, predominantly, expansively, voluminously, extravagantly
6 Syllables
uncustomarily, comprehensively, immoderately