Daft/dæft/ Definition 1 of 2Pro Tip 1/3Informality Use 'daft' in casual conversations, not in formal writing or speeches. You'd be daft to miss out on this party. Pro Tip 2/3Negative Connotation 'Daft' often suggests a lack of common sense or practicality in someone's actions. Only a daft person would go out in the storm without an umbrella. Pro Tip 3/3British Usage While understood globally, 'daft' is more commonly used within the UK. He's always forgetting his keys, such a daft thing to do.