Listening and communications skills
As my ADHD partner and I have been sort of haltingly preparing to have a common future, it seems to happen increasingly that I have brought up topics that should be mutually discussed, and he doesn't seem to be hearing me (there's no response indicating "I agree", or "I disagree", "I need more information", or "I don't really care" etc. and he persists in whatever course of action or inaction was ongoing with regard to the topic) or very often he asks a question that makes it clear he doesn't recall information or an opinion I gave when we discussed the topic before.