Dolt/dəʊlt/ Definition 1 of 1Pro Tip 1/3Informal Insult Used in casual settings to lightly mock someone's intelligence. Not for formal use. When Jake forgot his keys again, his brother called him a dolt. Pro Tip 2/3Playful Teasing Sometimes used among friends as a playful insult without serious offense. I told my friend, 'Only a dolt would miss that movie reference!' Pro Tip 3/3Mild Offensiveness While offensive, 'dolt' is milder than harsher insults such as 'idiot.' After spilling his coffee, he muttered, 'I'm such a dolt.'