erstwhile
1. [ adverb ] at a previous time
Synonyms: once formerly erst at_one_time
Examples:

"once he loved her" "her erstwhile writing"

2. [ adjective ] belonging to some prior time
Synonyms: former once onetime sometime quondam
Examples:

"erstwhile friend" "our former glory" "the once capital of the state" "her quondam lover"

Related terms: past
Similar spelling:   erectile