The word "stern" is defined as strict, severe, and uncompromising. Synonyms for the word "stern" include strict, austere, authoritarian, unyielding, and inflexible. Other synonyms for "stern" are rigid, firm, unsympathetic, harsh, and somber. It can be used to describe a person's facial expression, tone of voice, or behavior. A stern teacher or boss is someone who expects high standards and strict adherence to the rules. Alternatively, a stern judge or punishment can indicate a serious or severe consequence for an action. Regardless of how it is used, the word "stern" implies a certain level of inflexibility and strictness in its connotation.