The Collaborative International Dictionary of English v.0.48:

Hamper \Ham"per\, v. t. [imp. & p. p. Hampered (-p[~e]rd); p.
   pr. & vb. n. Hampering.]
   To put in a hamper.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "hampering":
   arrest, arrestation, arrestment, blockage, blocking, burdensome,
   check, clogging, closing up, closure, constriction, cramp,
   cumbersome, cumbrous, delay, detainment, detention, encumbering,
   fixation, foot-dragging, hindering, hindrance, holdback, holdup,
   impediment, impedimental, impeding, impeditive, inhibition,
   interference, interruption, let, negativism, nuisance value,
   obstruction, obstructionism, occlusion, onerous, opposition,
   oppressive, repression, resistance, restraint, restriction,
   retardation, retardment, setback, squeeze, stranglehold, stricture,
   suppression