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• r  in an adulterous manner
  he behaved adulterously

• When Ingrid Bergman became adulterously pregnant by Roberto Rossillini in 1949, she was all but stoned out of the country.
• In a moment of passion (passion is always momentary in Compton-Burnett), Simon makes it a calamity by adulterously siring a son with Rhoda.
• There's the love story, of course, in which opposites warily circle, passionately and adulterously engage, and ruefully part.