|To someone out there, there's nothing remotely abstruse about this illustration.|
Adjective. Late 16th century.
[French abstrus(e) or Latin abstrusus pa. ppl. of abstrudere conceal, formed as ABS- + trudere thrust]
1. Obsolete. Hidden, secret. L16-M-18
2. Difficult to conceive of or apprehend; recondite. L16
Abstruse is a useful word; I like it. However, its effective use can be scuppered somewhat if the person you're talking to doesn't understand it, therefore rendering your keenly considered rhetoric ... well ... abstruse.