adj.形容詞かつては隆盛を誇ったThe once-thriving town is now a ghost town after the factory closed.
adj.形容詞以前は成功していたThe city boasts a rich history, with several once-thriving industries that shaped its identity.
adj.形容詞かつて繁栄したThe once-thriving business struggled to adapt to the new market conditions.
adj.形容詞かつて活況を呈したThe once-thriving community has seen better days.