Re: siderated: "Ill-fated" or "blasted" ?

...So when used to mean "struck with lightning" it is synonymous with "unlucky" in the sense of being "star-crossed" or merely "blasted"

Then where do all the positive the words like "considerate" come from? Are we to conclude that "con-" here means not "with" but rather "against", the opposite of "pro" = for? Or is there a considerably different root here altogether?

All of those don't seem to have much relationship to "sider-" = iron or star, either.