He is a rationalist, making all decisions based on logic and facts.

I am surprised at the irrationality of this system.

This system is too irrational to understand.

His behavior is illogical and incomprehensible.

His behavior was illogical and I couldn't understand it.

His opinion is always rational.

Geographic Information Systems are very useful tools for map making and spatial data analysis.

The automotive navigation system in my car has downloaded the latest map data.

My personal thought is that everyone should be treated equally.

He values his private life.