erstwhile

/ˈɜrstˌwaɪl/
adjective
  1. Former; of an earlier time; no longer current or existing.
    • The erstwhile champion returned to the ring for one final match.
    • The company's erstwhile CEO now works as a consultant for startups.
    • She visited her erstwhile hometown, now completely transformed by new buildings.
adverb
  1. In the past; formerly; at an earlier time.
    • He was erstwhile a teacher before becoming a full-time writer.
    • The building, erstwhile a factory, now houses luxury apartments.
    • Erstwhile considered a remote village, it is now a bustling tourist destination.
Antonyms
What does "erstwhile" mean? | whatsthatwordmean | whatsthatwordmean