Monish is a word which means to warn or advise someone earnestly. There are a number of synonyms which can be used in place of monish based on the context in which it is being used. These include, admonish, reprimand, caution, counsel, caution, advise, forewarn and notify. While each of these words has a slightly different connotation, they can all be used interchangeably with monish, and can help to add variety and nuance to your writing. Regardless of which synonym you choose to use, it is important to make sure that your meaning is clear, and that your tone is appropriate to the situation.