Erstwhile

[urst-hwahyl, -wahyl] /ˈɜrstˌʰwaɪl, -ˌwaɪl/

adjective
1.
former; of times past:
erstwhile friends.
adverb
2.
Archaic. formerly; .
/ˈɜːstˌwaɪl/
adjective
1.
former; one-time: my erstwhile companions
adverb
2.
(archaic) long ago; formerly
adv.

1560s, from Middle English erest “soonest, earliest,” from Old English ærest, superlative of ær (see ere) + while. As an adjective from 1903. Cognate with Old Saxon and Old High German erist, German erst.

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