what does " interested against"mean?
“Yeah, because it’s at the bottom of the Thames,” said Wardle.
“Course it isn’t,” said Strike. “The killer’s got it. He’ll have got it off her before he threw her into the river.”
“Fuck off!” jeered Carver, and Wardle, who had seemed interested against his better judgment, shook his head.

Question

Answer

"Against his better judgement" is a set phrase. He was interested in Strike's idea, even though he suspected it was wrong or perhaps he suspected it would only lead to more trouble.

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