characterized by liveliness and light-heartedness; "buoyant spirits"; "his quick wit and chirpy humor"; "looking bright and well and chirpy"; "a perky little widow in her 70s"
If you are in a buoyant mood, you feel cheerful and behave in a lively way. You will feel more buoyant and optimistic about the future than you have for a long time. = cheerful
A buoyant economy is a successful one in which there is a lot of trade and economic activity. We have a buoyant economy and unemployment is considerably lower than the regional average Analysts expect the share price to remain buoyant