obstructive
  (a.)妨害的,阻礙的,妨礙的妨礙物,妨礙物
  ob·struc·tive /-tɪv/ 形容詞
  梗阻的,閉塞的
  Ob·struct·ive a.  Tending to obstruct; presenting obstacles; hindering; causing impediment. -- Ob*struct*ive*ly, adv.
  Ob·struct·ive, n. An obstructive person or thing.
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  obstructive
       adj : preventing movement; "the clogging crowds of revelers
             overflowing into the street" [syn: clogging, hindering,
              impeding]