vacillatory

• They are always "struggling to survive" and the vacillatory vagueries of the parameters of "poverty" is just one of the "demons" that they bravely fight. —  Capitol Hill Coffee House
• -- Disgusted with Musa's vacillatory conduct, on the 22d I sent him a letter containing a bit of my mind. —  The Discovery of the Source of the Nile
• As to money, he had given her almost carte blanche, having at one vacillatory period of his —  The Prime Minister
• For Lee, the 82nd Scripps National Spelling Bee began with the Round 1 written test, which included words such as asylum, congenital, vacillatory, onychorrhexis and abyss.
• "Why, my course here in the United States," said the Old Year -- "though perhaps I ought to blush at the confession -- my political course, I must acknowledge, has been rather vacillatory, sometimes inclining toward the Whigs, then causing the administration party to shout for triumph, and now again uplifting what seemed the almost prostrate banner of the opposition; so that historians will hardly know what to make of me in this respect. —  Twice Told Tales

Roget's II: The New Thesaurus