When it comes to warning or advising someone against something, there are various synonyms you can use rather than the typical phrase "cautioned against." These include admonished, advised against, cautioned, counseled against, dissuaded, exhorted, forewarned, put on guard, rebuked, remonstrated, and warned about. Each of these words has a slightly different connotation and can be used depending on the context or level of severity of the situation. Regardless of the specific word chosen, the goal is to communicate a sense of concern for the person and a desire for them to be safe or make well-informed decisions.