formerly 29 synonyms and 2 antonyms for formerly, ranked by how commonly they're used. Adv — At an earlier time; previously. Synonyms for formerly afore aforehand already antecedently at one time before beforehand beforetime ere erenow erewhile erstwhile erstwhiles foretime in advance in the past once late precedently previously sometime sometimes therebefore while whilere whilom yestertide yestertime yet Antonyms for formerly currently subsequently ← Back to the full definition of formerly