Synonyms of previously

1 Syllable
fore, then, back, once
2 Syllables
ahead, ante, oncer, forward, forer, anter
3 Syllables
advance, formerly, already, hitherto, before, erstwhile, afore, one-shot
4 Syllables
precendently, anteriorly, beforehand, precedently
5 Syllables
aforetime, antecedently, heretofore, beforetime