1) Born of adultery 2) Characterized by adulteration 3) Conceived in adultery 4) Illegitimate 5) Of or involving adultery 6) Spurious 
• (n.) An illegitimate child. • (a.) Proceeding from adulterous intercourse. Hence: Spurious; without the support of law; illegal.
an unlicensed castle
A·dul'ter·ine adjective [ Latin adulterinus , from adulter .] Proceeding from adulterous intercourse. Hence: Spurious; without the support of law; illegal. « When any particular class of artificers or traders thought proper to act as a corporation without a charter, such were called...
The term adulterine was applied to British castles in the Middle Ages that were crenelated without the owner having bought a license to erect battlements from the monarch.
[adj] - conceived in adultery
adulterine 1. Characterized by adulteration (to make impure, spurious, or inferior by adding extraneous or improper ingredients); spurious. 2. Illegal, unauthorized by law. 3. Born of adultery (voluntary sexual intercourse between a married person and a partner other than the lawful spouse).
adjective conceived in adultery
characterized by adulteration; spurious. · born of adultery. · of or involving adultery.