rea·son·a·ble 
(rēzə-nə-bəl)
(rēzə-nə-bəl)adj.
1. Capable of reasoning; rational: a reasonable person.
2. Governed by or being in accordance with reason or sound thinking: a reasonable solution to the problem.
3. Being within the bounds of common sense: arrive home at a reasonable hour.
4. Not excessive or extreme; fair: reasonable prices.
rea′son·a·bili·ty, reason·a·ble·ness n.
reason·a·bly adv.