The word "de-finable" refers to something that can be defined or explained. Its antonyms, on the other hand, would refer to those things that cannot be defined or explained. Some of the antonyms for "de-finable" might include undefinable, mysterious, cryptic, enigmatic, or inexplicable. These words describe concepts or phenomena that are difficult to articulate or fully understand. They may be beyond our comprehension or knowledge, or they may be intentionally shrouded in secrecy. Whatever their origin may be, these antonyms highlight the limitations of language and human understanding when it comes to certain types of experiences, emotions, or ideas.