Furtive action is an activity that is done in a secretive or stealthy manner. The term can be broken down into two crossword solutions: STEALTH (7 letters) and STEALINGAPEEK (13 letters). STEALTH implies that the action is done in a way that is not easily detected, while STEALINGAPEEK suggests that the action is done quickly and without being noticed. Both terms imply that the action is done in a clandestine manner.