[1] : The Collaborative International Dictionary of English v.0.48

obstructive \obstruct"ive\, a. cf. f. obstrictif.
   tending to obstruct; presenting obstacles; hindering; causing
   impediment. -- obstruct"ively, adv.
   1913 webster
see also:
obstruct"ively 

[2] : The Collaborative International Dictionary of English v.0.48

obstructive \obstruct"ive\, n.
   an obstructive person or thing.
   1913 webster

[3] : WordNet (r) 2.0

obstructive
     adj : preventing movement; "the clogging crowds of revelers
           overflowing into the street" syn: clogging, hindering,
            impeding
see also:
clogging hindering impeding 

[4] : Moby Thesaurus II by Grady Ward, 1.0

48 moby thesaurus words for "obstructive":
   choking, complaining, constrictive, contrary, counterproductive,
   crosswise, disputatious, disputing, dissentient, dissenting,
   fractious, hindering, hindersome, in the way, inhibiting,
   inhibitive, interrupting, interruptive, noncooperative, objecting,
   obstructing, obstruent, occlusive, on the barricades,
   proof against, protesting, rebellious, recalcitrant, refractory,
   reluctant, renitent, repellent, repressive, resistant, resisting,
   resistive, restrictive, retardant, retardative, stifling,
   strangling, suppressive, troublesome, uncooperative, unsubmissive,
   unyielding, up in arms, withstanding

Obstructive >> O Words
Obstructive, definition of term: Obstructive
obstructive_pag1.html