Crummy means poor in quality, or just unpleasant. A crummy hotel is cheap and a bit sad. A crummy day is one you did not enjoy. You can also say you feel crummy when you feel slightly ill or low — not very sick, just not right.

Crummy means Crummy的意思是 poor in quality品質差， or just unpleasant或就是讓人不舒服 A crummy hotel一間crummy的旅館， is cheap and a bit sad是便宜又有點寒酸的 A crummy day是crummy的一天， is one you did not enjoy就是你過得不開心的那種一天 You can also say you feel crummy你也可以說你feel crummy， when you feel slightly ill or low意思是你覺得有點不舒服或情緒低落—— not very sick, just not right不是很嚴重，只是不太對勁

It is informal. You would not put it in a careful report. It is more at home in American English, though British speakers use it too.

It is informal這是口語用法 You would not put it in a careful report你不會把它寫進正式的報告裡 It is more at home in American English它在美式英文裡比較常見， though British speakers use it too不過英式英文的人也會用

Though actually, it started as crumby, meaning full of crumbs, like a messy table; from there it drifted toward “cheap, no good.” Some people still write crumby, but crummy is the usual spelling for the “bad” meaning.

Though actually不過其實， it started as crumby它一開始是寫成crumby， meaning full of crumbs, like a messy table意思是「全是碎屑」，就像一張髒兮兮的桌子； from there it drifted toward "cheap, no good."後來意思慢慢變成「便宜、不好」。 Some people still write crumby有些人還是寫crumby， but crummy is the usual spelling for the "bad" meaning但crummy才是「差」這個意思常見的拼法

It is not a swear word, but it is not polite praise either.

It is not a swear word它不是一個罵人的髒字， but it is not polite praise either但也不是禮貌的稱讚