different in size, level, amount, etc.

The slices were unequal in size. 这两片大小明显不一样。

not treating everyone the same; unfair

Until women are paid as much as men, they will be competing on unequal terms. 在男女同工同酬前，妇女将会一直在不平等的条件下与男人竞争。

They have an unequal relationship. 他们之间的关系相当不平等。

to not have the necessary ability, power, or qualities to achieve something

He tried to cheer her up but found himself unequal to the task. 他想让她高兴起来，但发现他根本无法做到。