Etymology
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cumbrous (adj.)

late 14c., of things, "obstructing movement or vision;" c. 1400, "cumbersome, troublesome, clumsy, unwieldy, difficult to use," also of persons, "causing trouble," from cumber + -ous.

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Definitions of cumbrous

cumbrous (adj.)
difficult to handle or use especially because of size or weight;
cumbrous protective clothing
Synonyms: cumbersome
From wordnet.princeton.edu