Other forms: hypercritically
Hypercritical describes someone who is full of complaints. That friend you love but avoid going to restaurant with because she thinks the burger is slightly cold, the fork's not shiny enough, the bread too bready? Definitely hypercritical.
Make sure you don't mistake hypercritical for hypocritical. If you've ever felt hyper, you know it means "too much energy." So someone who is hypercritical puts too much energy into criticizing and judging. But if you're hypocritical, it means you don't live by the high standards you claim you have. Unfortunately, that means it's possible for a person to be both hypercritical and hypocritical.