The antonym for the word recommendation would be "dissuasion" or "discouragement." Dissuasion means to discourage someone from doing something or advising against it. In contrast, a recommendation is a suggestion or advice given suggesting a course of action. Dissuasion implies the act of trying to dissuade or persuade someone not to proceed with a particular action or decision. Similarly, discouragement can mean to dishearten, dampen or deter someone from performing or engaging in a particular task or activity. Both dissuasion and discouragement are the opposite or antonyms of recommendation.