Erstwhile

['ɜːstwaɪl] or ['ɝstwaɪl]

(adj.) belonging to some prior time; 'erstwhile friend'; 'our former glory'; 'the once capital of the state'; 'her quondam lover' .

Typist: Toni--From WordNet

(adv.) Till then or now; heretofore; formerly.

Checker: Lorenzo

Where is my erstwhile savior? Edgar Rice Burroughs. A Princess of Mars.
To be prisoner of your erstwhile captive? Edgar Rice Burroughs. The Gods of Mars.

Checker: Lorenzo