monish

from WordNet (r) 3.0 (2006)

monish
    v 1: warn strongly; put on guard [syn: {caution}, {admonish},
         {monish}]
    2: admonish or counsel in terms of someone's behavior; "I warned
       him not to go too far"; "I warn you against false
       assumptions"; "She warned him to be quiet" [syn: {warn},
       {discourage}, {admonish}, {monish}]

from The Collaborative International Dictionary of English v.0.48

Monish \Mon"ish\, v. t. [OE. monesten. See {Admonish},
   {Monition}.]
   To admonish; to warn. See {Admonish}. [Archaic] --Ascham.
   [1913 Webster]