to block or close (something) up with an obstacle
The road has been obstructed by a landslide
The fence obstructs the view
to impede the progress of (something or somebody)
obstructive /-tiv/ adj
obstructively /-tivli/ adv
obstructiveness /-tivnis/ noun
obstructor noun
[Latin obstructus, past part. of obstruere, from ob- + struere to build]