As an adjective obstructive
is causing obstructions.
As a verb obstruct is
to block or fill (a passage) with obstacles or an obstacle see synonyms at block.
Other Comparisons: What's the difference?
* I wanted to see his report on me, but my manager was being obstructive .
To block or fill (a passage) with obstacles or an obstacle. See Synonyms at block.
To impede, retard, or interfere with; hinder: obstructed my progress.
To get in the way of so as to hide from sight.
* See also