The word "in-validate" means to make something invalid or null and void. Conversely, the antonyms of "in-validate" are words that denote validity or confirmation. These include words such as validate, authenticate, approve, confirm, endorse, and certify. When something is validated, it means that it has been checked and confirmed as true or accurate. Authentication refers to the process of verifying the identity of a user or system. Approval, on the other hand, means that something has been accepted officially, while endorsement denotes the support or recommendation of something by an individual or group. Finally, certification implies that something has been tested and found to meet specific standards or requirements, making it valid and trustworthy.