i Register
In some senses, erstwhile is marked as formal, literary. Watch for register when choosing this word.
erstwhile
UK /ˈɜː(ɹ)st.waɪl/ US /ˈɝst.waɪl/
adj 2adv 1
Definitions
adv
1
Formerly; in the past.
adj
1
Former, previous.
“Scarcely had Alice reached her twentieth birthday, than she gave her erstwhile fiancée^([sic]) his formal congé.[…]”
As an aftermath of the erstwhile competition between companies, 41 goods depots served the Liverpool and Birkenhead docks in 1923.
2
Respected, honourable.
If you're for one of my erstwhile opponents, that's O.K. Just don't work too hard.
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