not a bone in your body
not have a (kind of) bone in (one's) body
To not have any amount of some negative characteristic or attribute. She started screaming at you for your mistake? Wow, I thought she didn't have a mean bone in her body. There's no way he lied to you—he doesn't have a dishonest bone in his body.
not a — bone in your bodynot the slightest trace of the specified quality.
1999 Scott Turow Personal Injuries I mean, I like Betty. Not a mean bone in her body.