sprightliest
adj. 活泼的;愉快的(sprightly 的变形)
例句
Those who have read his prose writing must have noticed how gaily and airily it flows on like the sprightliest of conversation.
读过他的散文的人一定会注意到,他的散文是怎样的欢乐轻快,流水一般,就像他的谈话一样。