S: (adj) commonsense, commonsensible, commonsensical (exhibiting native good judgment) "arrive home at a reasonable hour"; "commonsense scholarship on the foibles of a genius"; "unlearned and commonsensical countryfolk were capable of solving problems that beset the more sophisticated"
S: (adj) healthy, intelligent, levelheaded, level-headed, sound (exercising or showing good judgment) "healthy scepticism"; "a healthy fear of rattlesnakes"; "the healthy attitude of French laws"; "healthy relations between labor and management"; "an intelligent solution"; "a sound approach to the problem"; "sound advice"; "no sound explanation for his decision"
W: (n) reasonableness [Related to: reasonable] (the quality of being plausible or acceptable to a reasonable person) "he questioned the tenability of my claims"
W: (n) reasonableness [Related to: reasonable] (goodness of reason and judgment) "the judiciary is built on the reasonableness of judges"