Defectless means without defects or flaws. Its primary antonym is defective, which means having a defect or imperfection. Another antonym is faulty, meaning flawed or imperfect. Another antonym is flawed, which implies that there is a problem or imperfection in the object. Other antonyms for "defectless" include blemished, incomplete, incomplete, and inadequate. In conclusion, "Defectless" means without flaws, and its antonyms imply that there are problems or imperfections present in the object or item. Therefore, it is always preferable to use defectless products for a better experience.