merry: suggests cheerful, joyous, uninhibited enjoyment of frolic or festivity: a ~ group of holiday revelers.    revel的名词1个l或2个l都正确


blithe: suggests carefree, innocent, or even heedless gaiety: arrived home late in her usual ~ way.   gay由形容词变名词: 变y为i加ety


jocund: stresses gladness marked by liveliness, elation and exhilaration of spirits: good news had left him in a ~ mode.    解释jocund的4个词都有字母L


jovial: suggests the stimulation of conviviality and good fellowship or the capacity for these: grew inceasingly ~ with every drink.


jolly: suggests high spirits expressed in laughing, bantering, and jesting and a determination to keep one's companions easy and laughing: our ~ host enlivened the party.

merry: blithe: jocund: jovial: jolly:

记忆方法: 1）一个简单的方法是：MB分别欢喜欢庆，无忧无虑。
           其余三个都以J开头，都是高兴兴高采烈，jolly程度最高，jovial关系欢宴，jocund则最接近glad的一般通用色彩。


         2）另外，三个J要么包含字母L，要么用L解释。

         3）欢乐的意思是高兴轻松mean showing high spirits or lightheartedness.