a. 1. Rendering action or motion difficult or toilsome; serving to obstruct or hinder; burdensome; clogging. [ 1913 Webster ]

He sunk beneath the cumbrous weight. Swift. [ 1913 Webster ]

That cumbrousand unwieldy style which disfigures English composition so extensively. De Quincey. [ 1913 Webster ]

2. Giving trouble; vexatious. [ Obs. ] [ 1913 Webster ]

A clud of cumbrous gnats. Spenser.

-- Cum"brous*ly, adv. -- Cum"brous*ness, n. [ 1913 Webster ]