Idiot/ˈɪdiət/ Definition 1 of 4Pro Tip 1/3Casual Insult Used casually among friends, it might be less offensive but still be careful with usage. You forgot the tickets? You're such an idiot! Pro Tip 2/3Negative Connotation While sometimes playful, it's essentially negative and can hurt feelings. Calling someone an idiot can be very hurtful. Pro Tip 3/3Not Professional Avoid using 'idiot' in professional or formal settings as it's inappropriate. In a business meeting, never call a colleague an idiot.