1) Unreasonable 
Counterintuitive means contrary to what seems intuitively right or correct. A counterintuitive proposition is one that does not seem likely to be true when assessed using intuition, common sense, or gut feelings. Scientifically discovered, objective truths are often called counterintuitive when intuition, emotions, and other cognitive processes ou...
[adj] - contrary to what common sense would suggest
adjective contrary to what common sense would suggest
counter to what intuition would lead one to expect: The direction we had to follow was counterintuitive--we had to go north first before we went south.
contrary to what common sense would suggest