"erstwhile" in the adjective sense
1. erstwhile, former, old, onetime, one-time, quondam, sometime
belonging to some prior time
"erstwhile friend"
"our former glory"
"the once capital of the state"
"her quondam lover"
"erstwhile" in the adverb sense
1. once, formerly, at one time, erstwhile, erst
at a previous time
"at one time he loved her"
"her erstwhile writing"
"she was a dancer once"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License