covert

secret, covert, stealthy, furtive, clandestine, surreptitious, underhanded mean done without attracting observation. secret implies concealment on any grounds for any motive. met at a secret location covert stresses the fact of not being open or declared. covert intelligence operations stealthy suggests taking pains to avoid being seen or heard especially in some misdoing. the stealthy step of a burglar furtive implies a sly or cautious stealthiness. lovers exchanging furtive glances clandestine implies secrecy usually for an evil, illicit, or unauthorized purpose and often emphasizes the fear of being discovered. a clandestine meeting of conspirators surreptitious applies to action or behavior done secretly often with skillful avoidance of detection and in violation of custom, law, or authority. the surreptitious stockpiling of weapons underhanded stresses fraud or deception. an underhanded trick