HSK 7-9
快活
kuàihuo形
happy; cheerful
几个孩子在溪边追蝴蝶，快活极了。
Jǐ ge háizi zài xībiān zhuī húdié, kuàihuo jí le.
Several children chased butterflies by the stream, utterly delighted.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.