- a factor that is difficult or impossible to estimate or assess难以估量的因素, 不可估量的因素：
there are too many imponderables for an overall prediction.
做全面的预报有太多难以估量的因素。
1
- difficult or impossible to estimate, assess, or answer难以估量（或回答）的, 不可估量（或回答）的：
an imponderable problem of metaphysics.
难以回答的形而上学的问题。
2
- archaic or poetic/literary very light〈古或诗/文〉非常轻的。
派生词