dishonest
dishonorable
playful
arch
base
blackguardly
degraded
devilish
elfish
elvish
foolish
full of mischief
high-spirited
impish
infamous
knavish
mischief-loving
mischievous
notorious
prankish
pranksome
pranky
puckish
rascally
recreant
reprobate
scampish
scapegrace
scoundrelly
sportive
trickish
tricksy
tricky
vagrant
vile
villainous
waggish
boyish
conspiratorial
coquettish
coy
frolicsome
gleeful
good-humoured
ironic
light-hearted
merry
mirthful
saucy
sly
whimsical
wry