disaffiliation. opposition. separation. In that general sense, then, the opposite of "cousin" would be "unrelated." dissimilarity. Wiki User August 21, 2015 12:47PM. Top antonyms for cousin (opposite of cousin) are stranger, niece and combatants. Need antonyms for cousin? antagonism. Cousin antonyms. Cousin: a person connected with another by blood or marriage. Here's a list of opposite words from our thesaurus that you can use instead. Related Questions. nonrelative. Synonyms: kin, kinsman, relation… Antonyms: nonrelative… Find the right word. What is the opposite of cousin? There really is no opposite word; the opposite of a paternal cousin is a maternal cousin. Asked in Synonyms and Antonyms In English cousin denotes a family relationship, it is not gender specific. disunion. Noun Opposite of family relation. cousin-german relation first cousin relative full cousin Antonyms descendant ancestor unconnectedness connectedness absolute dissociation. What is opposite gender of cousin?