cheerful

Compared meaning: feeling pleased, grateful, or happy (adjective).

比较义项：因某事而感到愉悦、欣慰或满意的心情（形容词）。

• glad

  Glad shows you feel pleased or relieved about a specific fact, often with 'that' or 'to'; it's a light, everyday reaction word, not used to describe someone's general personality.

  glad表示因某个具体的事实而感到高兴或欣慰，常与that或to连用；这是一个轻松、日常的反应用词，不用来形容一个人一贯的性格。

  I'm glad the rain finally stopped before the game started.

  我很高兴比赛开始前雨终于停了。

• thankful

  Thankful specifically expresses gratitude for something someone did or something fortunate, usually with 'for' or 'to'; it carries an appreciative, sometimes formal tone stronger than plain pleasure.

  thankful专门表示因某人所做的事或某种幸运而心怀感激，常与for或to连用；语气比单纯的高兴更带有感恩、有时更正式的色彩。

  I am thankful for my family's support during difficult times.

  在困难的时候，我很感激家人的支持。

• cheerful 本词

  Cheerful describes a lasting happy, upbeat mood or personality trait — a person's expression or manner — rather than relief about one particular fact, and rarely takes a 'that' clause.

  cheerful形容一种持久的、积极乐观的心情或性格——即一个人的表情或举止——而不是因某个具体事实而感到欣慰，也很少接that从句。

  The waiter greeted us with a cheerful smile every morning.

  服务员每天早上都用愉快的笑容迎接我们。

Glad, thankful, and cheerful all describe positive feelings. Glad means pleased about one fact, often with 'that' or 'to', and sounds casual. Thankful means grateful for something, usually with 'for' or 'to'. Cheerful describes a lasting happy, upbeat mood or personality, not one reaction.

这三个词都表示正面的情绪感受，但语气和侧重不同：glad强调因具体的事而感到高兴或欣慰，语气随意；thankful强调感激、庆幸，常与for或to搭配；cheerful强调性格或情绪上的开朗、乐观，常用来形容人的神态或举止，不一定针对某件具体的事。