Synonym for "bad loser"

[ontheboil]

DS has a target to use ambitious vocabulary in his homework, and is looking for a synonym for "bad loser". Any ideas?

Sour grapes

John McEnroe? (in the old days)

There must be a modern footballer equivalent surely.

ungracious in defeat

The boy, who clearly was not familiar with the wisdom of Rudyard Kipling's 'If', lost his head.

Thanks all - and in particular senua. The best I could do was "unmagnanimous in defeat" which sounded clumsy. 'Ungracious' is much more elegant.

Unsporting

Bad sport
Sore loser

spoilsport?

Dog in the manger?

petulant