: very weak
: not good enough : not successful or effective
fee·bler \-b(ə-)lər\ fee·blest \-b(ə-)ləst\
a : markedly lacking in strength
b : indicating weakness
a : deficient in qualities or resources that indicate vigor, authority, force, or efficiency
http://www.merriam-webster.com/dictionary/feeblePage 310 paragraph 1 – “Here Boy, feeble and shedding his coat in patches, is asleep by the pump, so Paul D knows Beloved is truly gone.”
I understand that Here Boy is just sleeping in the house, weak and lacking strength by the way the situation is described in the sentence. He is just laying there shedding off the patches on his skin.