Idiom
there isn't a [mean, jealous, unkind etc.] bone in bodythere isn't a [mean, jealous, unkind etc.] bone in (someone's) body
he/she doesn't have a [jealous, mean, unkind etc.] bone in his/her body - something that you say in order to emphasize that someone is not jealous, mean, unkind etc..She wasn't the possessive type, and there wasn't a jealous bone in her body.