Defect/ˈdiːfekt/ Definition 1 of 3Pro Tip 1/3Negative Connotation The term often implies something undesirable or unwanted in an object or system. The smartphone was returned due to a screen defect. Pro Tip 2/3Potential Severity 'Defect' can suggest varying levels of severity, from minor to critical. A minor defect in the paintwork doesn't affect the car's performance. Pro Tip 3/3Not Always Visible Some defects are not immediately apparent and may be discovered later. After a week, we noticed a defect in the TV's sound quality.