ICJ orders Israel to prevent genocide in Gaza, stops short of ordering ceasefire

What's the ICJ's actual ability to enforce this? "Orders" sounds like they have some sort of weight to throw around if Israel doesn't comply, but I'm not familiar with the ICJ or what possible consequences could arise if Israel simply decided it was going to do what it wanted.

In theory i think they are supposed to ask the security council to step in if the order is ignored. Which would be unlikely to do anything, so nothing.

I think its likely israel will comply. The order is pretty weak and mostly stuff israel already claims to be doing. It wouldn't be worth the PR hassle to ignore it.

Israel's government doesn't care about PR hassle from the usual suspect. We may notice that they've had plenty of that lately and it did not stop them at all.

Even if doing what the ICJ wants is easy, there's a strong reason not to (from their perspective) - it implies the ICJ should be obeyed and legitimizes them. But why should Israel do that? It's just another leftie NGO from Netenyahu's perspective. Start following what those guys want and soon they will have to do nothing even as Hamas attacks again and again.