noun.
Someone who obstructs, agent noun of obstruct
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
any structure that makes progress difficult
noun.
someone who systematically obstructs some action that others want to take
Word Usage
"" I was extraordinarily mistrustful of District Attorney Rice ' s sudden change from obdurate obstructer to newfound champion of justice " during her campaign, said Friedman attorney Ron Kuby ."