not elegant or graceful in expression; "an awkward prose style"; "a clumsy apology"; "his cumbersome writing style"; "if the rumor is true, can anything be more inept than to repeat it now?"
Something that is cumbersome is large and heavy and therefore difficult to carry, wear, or handle. Although the machine looks cumbersome, it is actually easy to use. = unwieldy
A cumbersome system or process is very complicated and inefficient. an old and cumbersome computer system = clumsy
difficult to handle or use especially because of size or weight; "a cumbersome piece of machinery"; "cumbrous protective clothing"