Energy, Liveliness, Vigor, Spirit
noun
If you have lively energy you have more than enough energy for everyone to start noticing. They come up to you and compliment you on your amazing liveliness.
かっき
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Just be careful because かつ is being shortened here to かっ. It's a pretty common change for on'yomi ending in つ, so keep your eyes open for more that do this!
この町は、とても活気があります。
This city is very lively.
マイケルのおかげで、会社に活気が生まれた。
Thanks to Michael, liveliness was brought to the company.
ファーマーズマーケットはいつも活気にあふれています。
The farmers market is always full of life.