furtive
adjective
[ ˈfəːtɪv ]
• attempting to avoid notice or attention, typically because of guilt or a belief that discovery would lead to trouble; secretive.
• "they spent a furtive day together"
Similar:
secretive,
secret,
surreptitious,
sly,
sneaky,
wily,
underhand,
under the table,
clandestine,
hidden,
covert,
cloaked,
conspiratorial,
underground,
cloak and dagger,
hole and corner,
hugger-mugger,
stealthy,
sneaking,
skulking,
slinking,
sidelong,
sideways,
oblique,
indirect,
black,
hush-hush,
shifty,
Origin:
early 17th century: from French furtif, -ive or Latin furtivus, from furtum ‘theft’.