Answer: fickle

AnswerCrossword Clue
FICKLENot at all loyal
FICKLENot steadfast
FICKLELike the Finger of Fate on "Laugh-In"
FICKLECapricious
FICKLELike a frequent flip-flopper
FICKLEProne to flip-flopping
FICKLEImpermanent
FICKLEMercurial
FICKLELoving today, not tomorrow.
FICKLELike Lady Luck
FICKLEInconstant
FICKLEChangeable on a whim
FICKLELacking loyalty
fickleto perplex (to puzzle (to perplex)) / not loyal
ficklenot constant, esp. in one's loyalties