shifty (adj.)
- acute
- adrift
- afloat
- alternating
- ambidextrous
- amorphous
- arch
- artful
- astute
- backstairs
- bent
- cagey
- calculating
- canny
- capricious
- changeable
- changeful
- clandestine
- clever
- close
- closemouthed
- collusive
- conniving
- conscienceless
- conspiratorial
- corrupt
- corrupted
- covert
- crafty
- criminal
- crooked
- cunning
- cute
- dangerous
- dark
- deceitful
- deceiving
- deep
- deep-laid
- designing
- desultory
- devious
- diplomatic
- discreet
- dishonest
- dishonorable
- dizzy
- double
- double-dealing
- doubtful
- dubious
- duplicitous
- eccentric
- elusive
- elusory
- erratic
- evasive
- false
- feline
- felonious
- fickle
- fishy
- fitful
- flickering
- flighty
- fluctuating
- foxy
- fraudulent
- freakish
- furtive
- giddy
- guileful
- hazardous
- hole-and-corner
- hugger-mugger
- ill-gotten
- immoral
- impetuous
- impulsive
- inconsistent
- inconstant
- indecisive
- indirect
- infirm
- ingenious
- insecure
- insidious
- insubstantial
- inventive
- irregular
- irresolute
- irresponsible
- knavish
- knowing
- lying
- mazy
- mendacious
- mercurial
- moody
- pawky
- perfidious
- perilous
- politic
- precarious
- privy
- provisional
- questionable
- quiet
- rambling
- ready
- resourceful
- restless
- risky
- roguish
- rotten
- roving
- scatterbrained
- scheming
- secret
- secretive
- serpentine
- shady
- shaky
- shameless
- shapeless
- sharp
- shifting
- shrewd
- sinister
- slick
- slippery
- sly
- smooth
- snaky
- sneaking
- sneaky
- sophistical
- spasmodic
- spineless
- stealthy
- strategic
- subtle
- supple
- surreptitious
- suspicious
- tactical
- temporary
- tentative
- ticklish
- traitorous
- treacherous
- tricksy
- tricky
- two-faced
- unaccountable
- uncertain
- uncommunicative
- unconscientious
- unconscionable
- uncontrolled
- undependable
- under-the-counter
- under-the-table
- undercover
- underground
- underhand
- underhanded
- undisciplined
- unethical
- unfixed
- unobtrusive
- unpredictable
- unprincipled
- unreliable
- unrestrained
- unsavory
- unscrupulous
- unsettled
- unsound
- unstable
- unsteady
- unsubstantial
- unsure
- untrustworthy
- untruthful
- vacillating
- vagrant
- variable
- volatile
- vulpine
- wandering
- wanton
- wary
- wavering
- wavy
- wayward
- whimsical
- wily
- wishy-washy
