Something that is cumbersome is large and heavy and therefore difficult to carry, wear, or handle.
unwieldy
Although the machine looks cumbersome, it is actually easy to use.
这机器虽然看起来笨重,其实使用起来很方便。
A cumbersome system or process is very complicated and inefficient.
an old and cumbersome computer system.
陈旧而效率低下的计算机系统。