The Collaborative International Dictionary of English v.0.48:
Obstructive \Ob*struct"ive\, a. [Cf. F. obstrictif.] Tending to obstruct; presenting obstacles; hindering; causing impediment. -- Ob*struct"ive*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
obstructively adv 1: in an obstructive manner; "he acted very obstructively when we tried to carry out our project" [syn: obstructively, hinderingly]