Willful abandonment refers to the purposeful and intentional act of deserting or abandoning someone or something. There are a number of synonyms for this term that can be used to better convey the idea of this act. Some of the best synonyms for willful abandonment include desertion, forsaking, relinquishment, betrayal, renunciation, and defection. Other related words that can be used to describe the act of willful abandonment include neglect, disregard, rejection, and estrangement. The use of synonyms can help to create a more nuanced and descriptive picture of this serious and often hurtful act.