Rationally

Adverb

 * 1) in a rational way

Thesaurus
analytically, artfully, astutely, circumspectly, cleverly, considerately, cunningly, discerningly, discreetly, in all conscience, in all reason, in reason, intelligently, judiciously, knowingly, logically, providently, prudently, reasonably, sagaciously, sanely, sensibly, shrewdly, smartly, soundly, syllogistically, thoughtfully, understandingly, wisely, within bounds, within reason, within reasonable limitations