erstwhile Meaning, Definition & Usage

1. adjective satellite belonging to some prior time
   old; quondam; onetime; sometime; one-time; former.
   
   • erstwhile friend
   • our former glory
   • the once capital of the state
   • her quondam lover
2. adverb at a previous time;
   erst; at one time; formerly; once.
   
   • at one time he loved her
   • her erstwhile writing
   • she was a dancer once

WordNet