The antonyms for the phrase "more unclasped" could be "fully clasped," "fastened," "secured," "locked," or "buttoned." These words refer to a state in which something is securely closed, and there is no possibility of it coming loose. Unlike unclasped, which indicates that an item has been released from its locked position, these antonyms suggest a state of stability and security. For instance, you might say that the door was "fully clasped" to indicate that it was locked tightly and impossible to open without a key. This language can be particularly useful when describing safety or security-related items, such as doors or safety equipment.