Hard and fast Definition 1 of 2Pro Tip 1/3Not Absolute Sometimes used to indicate that there may be exceptions, despite seeming strict. Even with hard and fast rules, there can be special cases. Pro Tip 2/3Cultural Nuance In different cultures, what's considered 'hard and fast' can vary widely. What's a hard and fast tradition here may not be so in another country. Pro Tip 3/3Emotional Weight Can indicate frustration when someone feels constricted by rules. She disliked the hard and fast dress code.