ultra-rational       
adjective (also ultrarational) uk/ˌʌl.trəˈræʃ.ən.əl/ us/ˌʌl.trəˈræʃ.ən.əl/
 超理性的
influenced only by reason and not by emotion
  We have to remember that voters are not puppets or ultra-rational robots, but flesh-and-blood humans. 
They might be expected to reject the offer as unfair, but in this case their ultra-rational side wins out over their emotional reaction.  有可能他们会认为不公平而拒绝这个提议,但在这个问题上,他们超理性的一面战胜了他们的情绪反应。 
 - More examples
 - Even the ostensibly ultra-rational world of science is not immune to the longing to find hidden patterns beyond our everyday experience.
 - Many professional economists seem to imagine people as ultra-rational beings, always motivated merely by maximizing personal profit.
 - What impressed me in this account were the stoical and ultra-rational responses of these ancient people to the volcanic eruption.