My Own Worst ENEMY is a phrase that is used to describe someone who is their own worst ENEMY, meaning they are the source of their own problems. The crossword solution for this phrase is ENEMY, which is a five-letter word. This phrase is often used to describe someone who is their own worst obstacle in life, and it can be used to refer to someone who is their own worst critic or who makes decisions that are detrimental to their own well-being.