This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One who systematically blocks or interrupts a process, especially one who attempts to impede passage of legislation by the use of delaying tactics, such as a filibuster.

n. someone who systematically obstructs the actions of others

n. someone who attempts to impede the progress of legislation

n. One who deliberately hinders progress; one who obstructs business, as in a legislative body.

n. One who factiously opposes and hinders the action of others; specifically, one who systematically, persistently, and factiously hinders the transaction of business in a legislative assembly; an obstructive; a filibuster.

n. someone who systematically obstructs some action that others want to take

"YELLIN: Now, Lou, Democrats say that Republicans will pay a price for what they call their obstructionist ways while Republicans say no, no, it is Democrats who will suffer come election time, meanwhile, both sides have to find agreement on a few issues if they hope to get anything done before Christmas."

disputant    controversialist    eristic   

naysayer    stonewaller   

filibuster   

constructionist   

andoppressive    steam-packet    end-of-grade    bully-boy    expostulatory    dunderhead    antiterrorist    matter-of-factness    strong-arm    Repub.