The most common and most likely answer to this crossword clue is the 9 letter word CHEERLESS
I've seen this crossword clue in The Guardian
C
H
E
E
R
L
E
S
S
More clues leading to the result CHEERLESS
- Miserable chap tucking into toast
- Depressing advice to overenthusiastic supporters?
- Bleak, ever dismal conclusion in game of strategy
- Grim and unpleasant leer interrupts game
- Game over before getting to grips with first level is not fun
- Reel around in game that’s depressing
- Depressing to find what supporters of those losing may do
- Dreary game interrupted by dancing reel
- dreary US TV series about the French
- Old TV series about Les? Miserable!
Buddy explains!
The straight part
We know that "not fun" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not fun = cheerless.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CHEERLESS mean?
CHEERLESS adjective- Devoid of cheer; gloomy.