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Adjective: obstructive  ub'strúk-tiv
  1. Preventing movement
    "the obstructive crowds of revelers overflowing into the street";
    - clogging, hindering, impeding
  2. Intentionally unaccommodating
    "the action was not offensive to him but proved somewhat obstructive";
    - disobliging, uncooperative

See also: preventative, preventive, unaccommodating, unobliging