If someone is grumpy, they are in a bad mood and easily annoyed. Small things bother them. They may look sour, speak shortly, or complain about nothing much.

If someone is grumpy如果一個人 grumpy（愛發脾氣），they are in a bad mood and easily annoyed表示他心情不好，而且很容易被惹毛。Small things小事 bother them就能讓他不爽。They may look sour他們可能臉臭臭的，speak shortly講話很衝，or complain about nothing much或是為了沒什麼大不了的事抱怨。

It is informal, common, and a little homely — milder and more everyday than “bad-tempered” in a serious sense. A famous picture is the “grumpy old man,” helped by the dwarf named Grumpy in Snow White, so learners sometimes think the word only fits old men. Anyone can be grumpy: a tired child, a hungry teenager, you on a Monday.

It這 is informal, common, and a little homely是口語、常見的字，帶點家常的味道——milder and more everyday than "bad-tempered" in a serious sense比嚴肅意義上的「bad-tempered」溫和一點，也更日常一點。A famous picture is the "grumpy old man,"一個有名的畫面是「grumpy old man」，helped by the dwarf named Grumpy in Snow White再加上《白雪公主》裡那個叫 Grumpy 的小矮人幫忙加深印象，so learners sometimes think the word only fits old men所以學英文的人有時候會以為這個字只能形容老男人。Anyone can be grumpy其實誰都可能 grumpy：a tired child累了的小孩，a hungry teenager餓肚子的青少年，you on a Monday或是星期一的你。

It can also be a light noun for a person who is often like this (“He’s an old grump”), but the usual word is the adjective.

It它 can also be a light noun for a person who is often like this也可以當一個輕鬆的名詞，指常常這樣的人 ("He's an old grump")（他是個老愛抱怨的人），but the usual word is the adjective但一般常用的還是形容詞。