Antonyms for the term "are source of strength" could include phrases such as "are weakness," "are detrimental," or "cause harm." These phrases suggest that the subject in question is not a positive influence, but rather has a negative impact. For example, unhealthy habits could be described as a source of weakness, and toxic relationships could be described as a source of harm. It is important to consider the context in which the term "are source of strength" is being used, as antonyms will vary depending on the specific situation. Identifying antonyms for a phrase can help to provide a contrasting perspective and broaden one's understanding of a topic.