noun
a feeling of doubt or hesitation with regard to the morality or propriety of a course of action
verb
to hesitate or be reluctant to do something because of moral or ethical concerns
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He had no scruple about lying to protect his own interests.
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She didn't have a single scruple when it came to cheating on the test.
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I have no scruples about skipping class today.
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His scruples were like a heavy weight on his conscience, preventing him from doing what he knew was wrong.