abstruse

\ab-STROOS; uhb-\, adjective: difficult to understand

I'm sorry Mr. Khan, but this eviction note is WAY too abstruse.
Fred: complex, enigmatic, abstruse.
Baseball ain't abstruse, Jimmy, just HIT THE FUCKIN' BALLLLLLL.
Thor had never been to a slumber party, she found this world of hairbraiding, gossiping, and oreo-dunking to be abstruse.
Mr. Private and Private Mister found each other to be abstruse at best.