What does cumbrous mean?
Cumbrous is an adjective describing anything that is unwieldy, bulky, or burdensome — something whose size, weight, or complexity makes it slow and awkward to handle, whether physically or figuratively. A cumbrous piece of furniture resists being moved; a cumbrous bureaucracy resists reform. The word connotes obstruction and inefficiency rather than mere largeness: what is cumbrous gets in the way. It derives from the same root as 'cumber' (to burden or hinder) and is closely related to the far more common 'cumbersome'. Indeed, that kinship explains much of its current status — since the two words mean nearly the same thing, writers overwhelmingly choose 'cumbersome', leaving cumbrous as a rarer, more formal alternative encountered mainly in literary or older texts. Knowing it is still useful: it enriches vocabulary for describing ponderous machinery, tangled procedures, or dense prose, and it offers a subtly elevated register when plain 'awkward' or 'heavy' feels too blunt.
adjectiveCumbrous describes something that is unwieldy or burdensome because of its bulk, weight, or complexity — slow or difficult to handle, carry out, or deal with. It often applies to objects, systems, procedures, or language that impede smooth action.
- (of things) heavy, large, or awkward to handle; unwieldy.
- (of processes, systems, or arrangements) cumbersome in a figurative sense — slow, inefficient, or difficult to manage.
- (formal/literary) burdensome; troublesome; causing difficulty or delay.
"The committee's cumbrous approval process delayed the project by months."
"He wrestled the cumbrous trunk down the narrow staircase, knocking pictures from the walls."
"Critics argued that the treaty's cumbrous dispute-resolution mechanism would render it unenforceable."
Cumbrous and cumbersome are near-identical twins — but one became a household word while the other quietly slipped into dictionaries' back pages.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cumbrous
Cumbrous comes from the Old English-derived verb 'cumber', meaning to burden or obstruct, which itself descends from the Old French 'combre'/'encombrer' (ultimately from Latin roots relating to obstruction). The adjective form arose in English in the late 16th century, carrying the sense of burdensome or hindering. Its near-twin 'cumbersome' developed from the same source at around the same time, and over subsequent centuries the two words remained synonyms while 'cumbersome' came to dominate everyday use. Related words sharing this lineage include 'encumber', 'cumber', and 'disencumber'.
Related word forms
How cumbrous is actually used
Cumbrous is considerably rarer than its close relative cumbersome, and today appears mainly in formal, literary, or deliberately archaic writing. It can describe both physical bulk (a cumbrous load) and metaphorical heaviness (a cumbrous legal code). Because it so closely duplicates 'cumbersome', modern writers usually reach for the more familiar term unless aiming for an older register.
Easily confused with cumbrous
Cumbersome is the far more common word with essentially the same meaning; cumbrous is an older, rarer synonym that carries a slightly more formal or literary tone.