Indifferent – having no particular interest or sympathy; unconcerned.
Apathetic – showing or feeling no interest, enthusiasm, or concern.
All of these are very good points.
I think Malcolm cared for Rumple as much as he could or was capable of, but it was never as a father/son type of relationship. There was an article before the episode premiered, that Malcolm saw Rumple was more of like a “tag-along” ; like Malcolm was burdened having him around. But he still cared enough for him to bring him to the spinsters, in case he really did plan on abandoning him (before Neverland), at least Rumple was with people who could care for him.
If Malcolm felt complete apathy towards Rumple, he would have left him years ago.