From Longman Dictionary of Contemporary Englishbad faithbad faithintentions that are not honest or sincere → faith
Examples from the Corpus
bad faith• In the present case the plaintiff did not allege, nor did the judge find, any bad faith by the defendants.• School officials can lose this qualified privilege if they act in bad faith or without regard for whether the statements are true.• And some councils are acting in bad faith.• In Anisminic, Lord Reid gave the following examples: It may have given its decision in bad faith.• Guinness was accused of bad faith, in particular for failing to adhere to promises made in the official offer documents.• I can't help feeling, therefore, that your critical position relies on a heavy dose of bad faith.• I think a leap of bad faith was made.• What intrigues me about programmes like You've Been Framed is their bad faith. 