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

Example Sentences

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

The experience was not fun, by his account.

From The Wall Street Journal ● Jun. 27, 2026

"If there's any way they could do away with the 12.30, 12.45 kick-off… the 4am wake-up is not fun in the United States."

From BBC ● May 28, 2026