It’s a splendid pine tree, isn’t it?
Splendid! Wow, that was such a beautiful shoot!
She rejected me magnificently clearly.
Every single thing you see is splendid. You saw it after all, so of course it's magnificent. Your eyes are so great that they make everything reflect you. And you're beautiful.
The readings for this word are both kun'yomi readings. You learned them already, so you should be able to read this on your own.