really bad

is not in our dictionary (yet). Here's what it could mean:

Results generated using artificial intelligence.

adjective

Of a notably low standard; exceptionally poor in quality, skill, or pleasantness.

Examples are provided to illustrate usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

For 72 hours I had really bad diarrhoea and nausea.

From BBC ● Sep. 4, 2026

My grandmother has been sick for a while, and this — well, it has just been a really bad week.

From Salon ● Aug. 31, 2026