nonkin
Etymology
From non- + kin.
nonkin means A person who is not one's relative. Lexicurio rates it Rare gem — a strength score of 81 out of 100.
noun
- A person who is not one's relative.“When it is necessary to state an unpleasant truth or an opposing opinion, or to make a request of a nonkin, it is done in as pleasant a speech as possible.”