Emily Dickinson Lexicon

UN-REA'SON-A-BLE, a. [s as z.]

1. Not agreeable to reason. Hooker.
2. Exceeding the bounds of reason; claiming or insisting on more than is fit; as, an unreasonable demand.
3. Immoderate; exorbitant; as, an unreasonable love of life or of money.
4. Irrational. [In this sense, see Irrational.]