I thiiink that miiiight be poison hemlock, Conium maculatum. Not 100% sure, though.

Should have spotted stems and be stinky if that one. But definitely one from the same family, anyway.

Another angle....hairy stems?

well, what about wild carrot, another noxious weed, similar to poison hemlock but no purple spots on the stem.

Here is a link that might be useful: wild carrot