Pert/pɜːrt/ Definition 1 of 4Pro Tip 1/2Positive Vibe Use 'pert' when describing someone with a positive and energetic attitude. Her pert demeanor lit up the room. Pro Tip 2/2Cute Assertiveness 'Pert' can imply a charming form of confidence, often seen in youthful individuals. The pert young intern confidently shared her ideas.