1
[ adjective ] marked by deception

Examples

"achieved success in business only by underhand methods"

Related terms

crooked

2
[ adjective ] marked by quiet and caution and secrecy; taking pains to avoid being observed

Examples

"a furtive manner" "a lurking prowler" "a sneak attack" "stealthy footsteps" "a surreptitious glance at his watch" "someone skulking in the shadows"

Related terms

concealed

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