Antonyms for the phrase "devoting oneself to" include neglecting, ignoring, disregarding, abandoning, and detaching oneself from. Neglecting implies a lack of care or attention, while ignoring indicates a deliberate refusal to acknowledge something. Disregarding suggests a dismissive attitude towards something or someone. Abandoning signifies giving up or leaving something behind, while detaching oneself from implies a lack of emotional involvement. These words are opposite in meaning to "devoting oneself to," which means to commit or dedicate oneself to a particular goal, person, or task with passion and determination.