The word "unmixableness" refers to the state of being incapable of mixing or blending. Some synonyms for this term include immiscibility, incompatibility, and non-combinability. Immiscibility refers to the inability of two or more substances to mix together due to differences in chemical properties. Incompatibility describes the state where two substances cannot work together due to conflicting properties or functions. Non-combinability implies a lack of compatibility or inability to combine, often due to differences in size or nature. Other synonyms for unmixableness may include incongruity, inconsistency, and irreconcilability, all of which denote a state of discord or inability to blend seamlessly.