1.
prosperous, thriving, flourishing
Describes something that is doing well and growing, such as an industry or business.
2.
active, lively, vigorous
Describes active participation or energetic activity.
3.
popular, prevalent
Describes something that is widely practiced or enthusiastically embraced.
盛ん is a na-adjective meaning 'prosperous,' 'thriving,' or 'active.'
Forms:
- Adverbial: 盛んに
- Modifier: 盛んな + noun
Conjugation:
- Negative: 盛んではない / 盛んじゃない
- Te-form: 盛んで
- Past: 盛んだった
Usage pattern: More common as a predicate (〜が盛んだ) than as a modifier.
Common collocations: 盛んな活動 (active efforts), 盛んな議論 (lively debate), 盛んに行われる (to be actively conducted).