Cumbrous /(k?m"br?s)/

Cum·brous

Cumbrous

a.
  1. Rendering action or motion difficult or toilsome; serving to obstruct or hinder; burdensome; clogging.
    He sunk beneath the cumbrous weight.
    That cumbrousand unwieldy style which disfigures English composition so extensively.
  2. Giving trouble; vexatious. [Obs.]
    A clud of cumbrous gnats.