You were never a ninety-eight pound weakling.

你从来就不是一个体重98磅、体质孱弱的人。

You're a coward and a weakling.

你是个胆小鬼，懦夫。

Can't you fight, weakling?

你不能战斗了？胆小鬼。

Can't you fight weakling?

你不能战斗了？胆小鬼。

How can an admirable contemporary scholar be a weakling?

当代了不起的学者怎么会是个软脚兔呢？