Spineless

[Couch Potatoe]

Someone who cannot or will not [do the right thing], even though a small part of them knows they should. Spineless people often use phrases like [I dont give a flying fuck] or I dont want to [get involved]

[Jason Yan]

Having no spine or backbone; invertebrate.

[Sonia]

A spineless person does not have much determination and is not willing to take risks: