D defs.my
Entry 2 senses Webster, 1913

Cumbrous

/(k?m"br?s)/ · Cum·brous · IPA /ˈkʌmbɹəs/
01 a. Rendering action or motion difficult or toilsome; serving to obstruct or hinder; burdensome; clogging.
  1. 1.
    Rendering action or motion difficult or toilsome; serving to obstruct or hinder; burdensome; clogging.
    “He sunk beneath the cumbrous weight.” Swift.
    “That cumbrousand unwieldy style which disfigures English composition so extensively.” De Quincey.
  2. 2.
    Giving trouble; vexatious.[Obs.]
    “A clud of cumbrous gnats.” Spenser.