disappoint/disappointed

Are you disappointed how you handled COVID?

And I get Trump's disappointed, because according to him, this was going to be the best pool in the history of water.

For example, last year I met with Manu Prakash from Stanford who was disappointed to realize the typical microscope and centrifuge to diagnose malaria costs tens of thousands of dollars and needs to be plugged in.

I went scuba diving in Greece, and I looked around me, and I just saw more plastic bags than fish, and I just so disappointed by that that I thought, "Why can't we just clean this up?"