Mudsill is a term that can mean a person who is lowly, uneducated, or lacking in refinement. Some synonyms for mudsill might include terms like proletarian, peon, menial, drudge, or laborer. These synonyms suggest that the person is engaged in hard work that is often physically demanding, and that they may not have access to the same educational or social opportunities as those in a higher position. Other synonyms for mudsill might include words like inferior, subordinate, or subservient. These words connote a sense of being beneath others and may suggest that the person is not highly valued or respected in their position.