one that was previously in a particular role or condition

एक ऐसा जो पहले किसी विशेष भूमिका या स्थिति में था

English Usage: She took an erstwhile role in the production as a favor.

Hindi Usage: उसने उत्पादन में एक पूर्व भूमिका निभाई।

former or previous

पूर्वतः

English Usage: He is an erstwhile champion of the sport.

Hindi Usage: वह खेल का पूर्वतः चैंपियन है।