1) Abstruseness 2) Illegibility 3) Impenetrableness 4) Inscrutability 5) Obscurity 6) Opaqueness 7) Unclearness 8) Unintelligibility 
• (n.) The quality of being incomprehensible, or beyond the reach of human intellect; incomprehensibleness; inconceivability; inexplicability.
In·com`pre·hen`si·bil'i·ty noun [ Confer French incompréhensibilité .] The quality of being incomprehensible, or beyond the reach of human intellect; incomprehensibleness; inconceivability; inexplicability. « The constant, universal sense of all antiquity unanimously confessing an i...
[n] - the quality of being incomprehensible
noun the quality of being incomprehensible