adulterine

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 adulterine guilds. Adam Smith. An illegitimate child. [R.]

Source: Webster's Revised Unabridged Dictionary (1913), United States public domain. See methodology for full licensing detail. Word validity for game play may differ from any official game dictionary.