Illwill is a word that denotes a feeling of animosity, spite or malice towards someone or something. It is a negative emotion that can cause harm to relationships or situations. But if you are trying to avoid using the word illwill, there are several synonyms that you can use in its place. Some of these synonyms include animosity, hatred, hostility, enmity, antagonism, resentment, antipathy, malevolence, animus, rancor, spite, venom, and acrimony. These words can be used in many different contexts, including personal relationships, business dealings, and political situations. So, next time you need to express negative feelings, consider using one of these synonyms for illwill instead.