Ineffability

Inability of an idea or feeling to be expressed with words

Ineffability is the quality of something that surpasses the capacity of language to express it, often being in the form of a taboo or incomprehensible term. This property is commonly associated with philosophy, aspects of existence, and similar concepts that are inherently "too great", complex or abstract to be communicated adequately. Illogical statements, principles, reasons and arguments may be considered intrinsically ineffable along with impossibilities, contradictions and paradoxes.

This keyword could refer to multiple things. Here are some suggestions: