The word "without favor" can be considered antonymous to words such as "biased" and "partial." It implies a sense of objectivity and neutrality towards a subject or situation, without any personal inclination or favoritism. Other antonyms for the word could include "preferential," "tainted," or "prejudiced." When we talk about taking a decision or action "without favor," we essentially mean that we are not influenced by any personal biases or external circumstances that could potentially sway our judgment. This is an essential trait that is valued in most professions, particularly in fields such as law, journalism, medicine, and policy-making.