1. Forbidden or tabu sexual intercourse between individuals
   - criminal congress

Type of: carnal knowledge, coition, coitus, congress, copulation, intercourse, relation, sex act, sexual congress, sexual intercourse, sexual relation

• hard-cooked egg
• hard-fought
• hard-hitting
• hard-nosed
• hard-of-hearing
• hard-on
• hard-pressed
• hard-shell
• hard-shell clam
• hard-shell crab
• hard-shelled
• hard-skinned puffball
• hard-to-please
• hard-wearing
• hard-won
• hardback
• hardbacked
• hardbake
• hardball
• hardboard
• hardbound
• hardcore
• hardcover
• harden
• Hardenbergia