The antonyms for the word "related mutually" suggest a lack of connection or interaction between two or more entities. These antonyms include unconnected, unrelated, independent, disconnected, and dissimilar. Unconnected refers to situations where there is no link between two or more parties, while unrelated suggests a lack of association between entities. Similarly, independent implies self-reliance and autonomy, while disconnected refers to a disconnect from something. Lastly, dissimilar denotes a lack of similarity or commonality between items. In essence, these antonyms for "related mutually" depict disconnectedness, isolation, and disassociation, all of which point to a lack of unity or synergy.