The dictionary I just consulted lists your definition as "archaic". "Reasonable" means (to a reasonable observer) a lot more than the ability to think logically

The dictionary I just consulted lists your definition as "archaic". "Reasonable" means (to a reasonable observer) a lot more than the ability to think logically: - having sound judgement; fair and sensible: no reasonable person could have objected. - based on good sense: it seems a reasonable enough request | the guilt of a person on trial must be proved beyond reasonable doubt. - archaic: able to reason logically: man is by nature reasonable. 2: as much as is appropriate or fair; moderate: a police officer may use reasonable force to gain entry. Thesaurus: sensible, rational, open to reason, full of common sense, logical, fair, fair-minded, just, equitable, decent; intelligent, wise, level-headed, practical, realistic; based on good sense, sound, judicious, well thought out, well grounded, reasoned, well reasoned, valid, commonsensical, advisable, well advised; tenable, plausible, feasible, credible, acceptable, admissible, believable