Male partner.
Either just a partner or husband.
Either all lazy with housework and looking after their own DC, cheaters, or that and mixed in with verbal abuse (that so many normalise), or some even physical abuse, although I don't know of anyone who's being physically abused currently, but know a few who's partner has hit them in the past
I have a friend who's H won't get up with the kids. Says he just can't. Then gets her to pick him up from social events, spends 0 time with his family. Won't engage with the kid activities
My STBXH never took any interest in our DC and just was so flaky. Spoke to me horrifically but was amazingly friendly and polite to everyone else so I looked like a liar for a long time. I kept evidence of it all in the end
Honestly, I really don't know of a single couple who's H treats them kindly and fairly.
I know not all men are bad! Some really good ones out there. I always look in awe when I'm on a day out with DS and see such a heavily involved Dad, having fun?! With his children, who actually speaks properly to his partner