Antonyms for the phrase "is source of strength" include words like drain, weakness, burden, obstacle, hindrance, and liability. These words are the complete opposite of what a source of strength represents, which is something that provides support, power, and advantage. Instead, a drain refers to something that drains energy and resources. A weakness is a lack of strength or resilience. A burden is an oppressive responsibility. An obstacle prevents progress. A hindrance hinders movement. A liability is a disadvantage. When faced with these antonyms, it is important to remember the phrase "is source of strength" and to focus on finding ways to overcome these obstacles by finding sources of strength elsewhere in the situation or in oneself.