The word inconceptible means something that is difficult or impossible to understand or comprehend. There are several synonyms that can be used instead of inconceptible, including incomprehensible, unfathomable, beyond words, indescribable, and ineffable. All of these words represent something that is beyond human understanding and defies explanation. In some cases, these words are used to describe religious or philosophical concepts that are difficult to put into words. Other times, they may be used to describe inexplicable events or occurrences. No matter how they are used, these synonyms all capture the essence of something that is beyond our comprehension.