From despise + -worthy.
despiseworthy (comparative more despiseworthy, superlative most despiseworthy)
- (rare) Worthy of being despised; despicable.
1947, Angela Mackail Thirkell, Peace breaks out:
- "[...] And he tried to make us jealous of each other just for fun, which I think was horrid and mean and terrifically despiseworthy," said Clarissa vehemently.