Synonyms of erstwhile
- 1 Syllable
- ex, past, late, old, once
- 2 Syllables
- former, quondam, oncer, whilom, time-worn, cast-off, previous, olden, exer, castoff
- 3 Syllables
- formerly, hitherto, preceding, preexistent, demode, prevenient, bygone, one-shot, one-time, prodromal, previously
- 4 Syllables
- erewhile, sometime, aforeknown, forerunning, onetime
- 5 Syllables
- above-named
- 6 Syllables
- aforementioned, above-mentioned, abovementioned