Obscure Terminology

adjective difficult to understand; profound

• The professor's lecture on quantum physics was filled with recondite concepts that left the students puzzled.
• I tried reading that recondite book you recommended, but I couldn't make heads or tails of it.
• Dude, that movie was so recondite, I fell asleep halfway through.
• Her emotions were like a recondite maze, difficult for anyone to navigate.

adjective a word that describes or gives more information about a noun, in this case 'ununderstandable' describes something that cannot be understood

• The complex scientific theory was ununderstandable to most of the students.
• The instructions were so ununderstandable that we had to ask for help.
• The new math concept is totally ununderstandable to me.
• His emotions were so mixed up and ununderstandable that no one could figure him out.