The word "adequation" refers to the state of being appropriate or suitable. Its antonyms include inadequacy, insufficiency, deficiency, and unsuitability. Inadequacy refers to the state of being insufficient or unsatisfactory, while insufficiency implies a lack of enough resources or capacity. Deficiency implies a lack of necessary qualities or attributes, while unsuitability refers to the state of being unfit or not appropriate for a specific purpose or situation. Therefore, it is essential to consider the antonyms of adequation when communicating your thoughts accurately, determining the right context to use them, and ensuring proper and clear understanding.