W: (n) reasonableness [Related to: reasonable] (the state of having good sense and sound judgment) "his rationality may have been impaired"; "he had to rely less on reason than on rousing their emotions"
S: (n) rationality, reason, reasonableness (the state of having good sense and sound judgment) "his rationality may have been impaired"; "he had to rely less on reason than on rousing their emotions"
W: (adj) rational [Related to: rationality] (consistent with or based on or using reason) "rational behavior"; "a process of rational inference"; "rational thought"