Nightmare
Bad Dream
noun
A bad dream is also known as a nightmare. Ah! Noooooo!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
主役が急病になったんだけど、代役が見つからなくてね。まさに悪夢だったよ。
The lead actor got sick all of a sudden and we couldn't find another actor to fill in for him. It was such a nightmare.
太った猫になって歩けないという悪夢を見た。
I had a bad dream that I turned into a fat cat that couldn’t walk.
腕を胸の前で組んで寝ると悪夢が見れるって聞いたから試したら、朝から晩までひたすらトイレ掃除をずっとしているという夢を見たよ。
I heard you can make yourself have nightmares if you sleep with your arms folded across your chest, so I tried it and I had a dream that I was cleaning a toilet nonstop from morning to night.