1. 大而笨重的;难以携带的
Something that is cumbersome is large and heavy and therefore difficult to carry, wear, or handle.

2. 复杂而低效的
A cumbersome system or process is very complicated and inefficient.

1. not elegant or graceful in expression

e.g. 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?

Synonym: awkwardclumsyinaptineptill-chosen

2. difficult to handle or use especially because of size or weight

e.g. a cumbersome piece of machinery
cumbrous protective clothing

Synonym: cumbrous