Weak Constitution 

Poor health; prone to catching colds or illnesses, or having to stay home in bed. Not physically strong or robust.

The winters were tough on his already weak constitution, putting him even further out of touch with his more athletic cousins.

Weak Constitution by MyrrhKat January 30, 2022

Weak constitution 

Someone with no back bone.

Wow, he lets them talk to him any kind of way. He never stands up for himself! He has a weak constitution.

Weak constitution by tko December 13, 2017

weak constitution 

A person lacking morales

She has a weak constitution.

weak constitution by Miguel San Grio March 13, 2014