The word invalidating means to nullify or declare something as invalid. Its antonyms are words that express the opposite meaning. These include validating, confirming, supporting, endorsing, authenticating, endorsing, and upholding. When we validate something, we prove its worth, value, or truth. We confirm or support it by offering independent evidence or testimony. Authenticating means proving that something is genuine, while endorsing shows that we approve or support something publicly. These antonyms for invalidating are useful because they help to strengthen and support our arguments, claims or ideas. By using them, we can show that something is valid, legitimate, or credible.