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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.
a. a person who deliberately obstructs business, esp in a legislature
b. (as modifier): obstructionist tactics.
ob•struc•tion•ist(əbˈstrʌk ʃə nɪst)
a person who deliberately delays or obstructs progress, esp. of business before a deliberative body.
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|Noun||1.||obstructionist - someone who systematically obstructs some action that others want to take|
naysayer - someone with an aggressively negative attitude
stonewaller - one who stonewalls or refuses to answer or cooperate; someone who delays by lengthy speeches etc.