Self-willedly is an adverb that describes behavior that is determined and stubbornly independent. Synonyms for self-willedly include obstinately, inflexibly, resolutely, headstrongly, tenaciously, unyieldingly, and pigheadedly. Each of these synonyms emphasize the persistence and unwavering nature of the person's behavior, whether it is in a positive or negative context. While self-willedly can convey a sense of decisiveness and conviction, it can also suggest a narrow-mindedness or unwillingness to compromise. Other words that might capture this sense of unyielding determination include single-mindedly, steadfastly, unswervingly, and unwaveringly. Regardless of the word used, these synonyms all point towards someone who is committed to their goals and beliefs, regardless of the challenges they face.