Learner's definition of MOLASSES
[noncount] chiefly US
: a thick, brown, sweet liquid that is made from raw sugar糖蜜；糖浆 — called also (British) treacle
slow as molasses
US, informal or slower than molasses
: very slow or slowly非常慢（的） -
I used to be a fast runner, but now I'm slow as molasses.我过去跑得快，现在却慢得很。
-
People have complained that the legislature is moving/working slower than molasses.人们对立法机关工作拖拖拉拉怨声载道。