adultering
/əˈdʌlt(ə)rɪŋ/Now rare
adjective
1That adulters; corrupting, debasing, adulterating.
2That commits or is characterized by adultery; adulterous.
Origin
Late 16th century; earliest use found in John Marston (bap. 1576, d. 1634), poet and playwright. From adulter + -ing.