weak sister

To people in Sandy Hook, "Trump comes across as a leader. This fellow, Biden, he comes across as a weak sister," Mr Kinner said.

“You could look at him and size him up as the weak sister,” White observed.

This is Ethan, who, I’m afraid, turns out to be something of a weak sister, going all shaky on the second date after Nikki smashes in the teeth and breaks the arm of a would-be mugger.

I was just being a weak sister.

You don't want a weak sister in there, nor do you want for one course to offer amenities or an experience that shouts down the other two.