The state of having good sense and sound judgment.

synonyms: rationality, reason.

Roget 498: intelligence, capacity, comprehension, understanding; cuteness, sabe [U.S.], savvy [U.S.]; intellect etc. 450; nous [Fr.], parts, sagacity, mother wit, wit, esprit, gumption, quick parts, grasp of intellect; acuteness etc. adj.; acumen, subtlety, penetration, perspicacy^†, perspicacity; discernment, due sense of, good judgment; discrimination etc. 465; cunning etc. 702; refinement etc. (taste) 850.    head, brains, headpiece, upper story, long head; eagle eye, eagle-glance; eye of a lynx, eye of a hawk.    wisdom, sapience, sense; good sense, common sense, horse sense [U.S.], plain sense; rationality, reason; reasonableness etc. adj.; judgment; solidity, depth, profundity, caliber; enlarged views; reach of thought, compass of thought; enlargement of mind.    genius, inspiration, geist [G.], fire of genius, heaven-born genius, soul; talent etc. (aptitude) 698.    [Wisdom in action] prudence etc. 864; vigilance etc. 459; tact etc. 698; foresight etc. 510; sobriety, self-possession, aplomb, ballast.    a bright thought, not a bad idea.    Solomon-like wisdom.    ... show more

Dutch: redelijkheid
Polish: racjonalność

Goodness of reason and judgment.

The property of being moderate in price or expenditures:
— The store is famous for the reasonableness of its prices.

synonyms: moderateness, modestness.

Moderation in expectations.

The quality of being plausible or acceptable to a reasonable person.

synonyms: tenability, tenableness.