名词

1. 恶梦;噩梦;梦魇
A nightmare is a very frightening dream.

2. 令人恐怖的处境;可怕的情景
If you refer to a situation as a nightmare, you mean that it is very frightening and unpleasant.

3. 恼人的情景;惹人烦的局面
If you refer to a situation as a nightmare, you are saying in a very emphatic way that it is irritating because it causes you a lot of trouble.

1. a terrifying or deeply upsetting dream

2. a situation resembling a terrifying dream

Synonym: incubus