Erstwhile (adjective)

Former, previously existing, or in existence at an earlier time.

Origin:

Late 16th century: from erst "formerly" + while "time".

Examples:

1. Her erstwhile friend betrayed her trust.
2. The once-great empire was now just a memory of its erstwhile glory.
3. The erstwhile queen had lost her throne and her power.
4. The erstwhile capital of the country was now just a small village.
5. He was now a shadow of his erstwhile self, a man broken by his experiences.