Cretin/ˈkriːtn/ Definition 1 of 2Pro Tip 1/3Offensive Term Cretin is considered derogatory and shouldn't be used lightly. Calling someone a cretin can be very hurtful. Pro Tip 2/3Colloquial Usage Used informally among friends but could be disrespectful if misunderstood. He joked about being a cretin after forgetting her birthday. Pro Tip 3/3Negative Connotation Implies a strong disapproval or frustration towards others' behavior. Don't be a cretin, follow the instructions carefully.