erstwhile
12 synonyms and 2 antonyms for erstwhile, grouped by meaning and by how common each one is.
Adjective — Former; belonging to an earlier time and no longer holding the position or relationship described.
Synonyms
Everyday swaps
Common words most readers know — safe in any writing.
Less common
Still standard English, but they carry more weight.
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
Synonyms by Meaning
1. adjective formal or literary
Former; belonging to an earlier time and no longer holding the position or relationship described.
“Her erstwhile business partner now runs a rival firm.”
Opposites
2. adverb archaic
Formerly; at a time in the past.
“The hall, erstwhile a chapel, is now a concert venue.”
How to use erstwhile
The word patterns that sound natural to a native speaker.
Literary. Overused in journalism, where plain 'former' usually reads better.
Etymology
From Old English ǣrest ('earliest'), the superlative of ǣr ('before'), combined with 'while'.
Full origin of erstwhile →