WordWeb Online

1. Showing reason or sound judgment
   - sensible
    
2. Not excessive or extreme
   "reasonable prices"
   - fair, fairish
    
3. Marked by sound judgment
   - sane

See also: commonsense, commonsensible, commonsensical, fair, healthy, intelligent, just, levelheaded, level-headed, logical, moderate, rational, reasonableness, reasonably, sound, tenable, valid, well-founded

Antonym: unreasonable

Encyclopedia: Reasonable