1. in a secret or hidden manner, especially to avoid detection or because something is forbidden

Examples

• The rebels met clandestinely in an abandoned warehouse.
• She clandestinely passed notes to her friend during class.
• The documents were clandestinely removed from the office.
• They communicated clandestinely through coded messages.
• The spy operated clandestinely for years without being detected.
• The couple met clandestinely because their families disapproved.