Antonyms for the word "more hermetical" would include terms such as open, accessible, transparent, communicative, and synonymous. The word hermetical is generally used to refer to situations or individuals that are closed off or difficult to understand, which is why antonyms for it tend to be words that suggest the opposite. Openness suggests a willingness to share information and ideas, while accessibility suggests that something is easy to approach or understand. Similarly, transparency implies honesty and clarity, while communicative means that someone is open to communicating and sharing ideas. Finally, synonymous suggests that something is straightforward and easy to understand.