Rationalistic

{ Ra′tion‐al‐is″tic (–ĭs″tĭk), Ra′tion‐al‐is″tic‐al (–tĭ‐kal), } a. Belonging to, or in accordance with, the principles of rationalism. — Ra′tion‐al‐is″tic‐al‐ly, adv.