soft leather, soft skin

a slow and cunning person; an apathetic person unwilling to get sth done (lit., "soft skinned snake")

(slang) someone who is apathetic and slack, who gives no regards to the criticism or advice o others; someone who has given up on themselves and just let themselves go; a lackadaisical person; to describe someone who is seemingly docile and obedient on the surface but who denies responsibilities in reality