A 'grudge' is a persistent feeling of ill will or resentment resulting from a past wrong or injury. Among the options, 'complaint' is the closest match as it can express grievance or dissatisfaction, though it's not a perfect synonym. 'Passion' means strong emotion, 'adoration' means deep love, and 'danger' means risk - these are not related to the meaning of grudge. A better synonym would be 'resentment,' 'bitterness,' or 'spite,' but given the options, 'complaint' is the most appropriate choice.