CUMBROUS
cumbersome, cumbrous
(adjective) difficult to handle or use especially because of size or weight; “a cumbersome piece of machinery”; “cumbrous protective clothing”
Source: WordNet® 3.1
Etymology
Adjective
cumbrous (comparative more cumbrous, superlative most cumbrous)
Unwieldy because of its weight; cumbersome.
(obsolete) Giving trouble; vexatious.
A cloud of combrous gnattes do him molest
Source: Wiktionary
Cum"brous (km"brs), a.
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. Giving trouble; vexatious. [Obs.]
A clud of cumbrous gnats. Spenser.
– Cum"brous*ly, adv.
– Cum"brous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition