Source : Webster's Revised Unabridged Dictionary (1913)

Obstructive \Ob*struct"ive\, a. [Cf.F. obstrictif.]
   Tending to obstruct; presenting obstacles; hindering; causing
   impediment. -- {Ob*struct"ive*ly}, adv.

Obstructive \Ob*struct"ive\, n.
   An obstructive person or thing.

Source : WordNet®

obstructive
     adj : preventing movement; "the clogging crowds of revelers
           overflowing into the street" [syn: {clogging}, {hindering},
            {impeding}]