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We found it difficult to laugh at his trite jokes.
Spot on !
Trite is an adjective. The noun form is triteness.
To be trite is to lack in freshness and originality. An example of this in a sentence would be, "She lacked creativity. She was trite."
Trite means a remark that is overused or lacks originality. A trite statement can be called a bromide or cliché.