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adj.
marked by quiet and caution and secrecy; taking pains to avoid being observed; "a furtive manner"; "a sneak attack"; "stealthy footsteps"; "a surreptitious glance at his watch"
adj.
marked by skill in deception; "cunning men often pass for wise"; "deep political machinations"; "a foxy scheme"; "a slick evasive answer"; "sly as a fox"; "tricky Dick"; "a wily old attorney"
adj.
implied though not directly expressed; inherent in the nature of something; "an implicit agreement not to raise the subject"; "there was implicit criticism in his voice"; "anger was implicit in the argument"; "the oak is implicit in the acorn"
adj.
impossible or nearly impossible to see; imperceptible by the eye; "the invisible man"; "invisible rays"; "an invisible hinge"; "invisible mending"