The patient is in 'critical condition'. = The patient is 'critical'. [=the patient is very sick or injured and may die]
a government program that is 'on the critical list' [=that is in danger of failing or being eliminated]
a nurse who specializes in 'critical care' [=the care of patients who are in critical condition]
(..) I mean, I liked it. I thought it had "applications". No, it has all that. Look, when it blows up, and it will once it reaches a critical mass of users, Pied Piper will be able to search the whole world of recorded music to find out if there's a match to see if you're infringing on any (..)2014 TvShow: Silicon Valley Title: Minimum Viable Product Season: 1 Episode 1
(..) Computers will prove you're right, and you'll put your wings back on You wanna run? Yeah, let's run. Fucking cold out here. This was obvious, it was a critical situation Losing both engines at a low altitude Over one of the most populated areas of the planet But you chose to land on the Hudson, (..)2016 Sully
(..) we see our families again. days of unplanned space travel... Where anything could go wrong. If it's mission critical, we die. Sign me up. All right, cowboy, slow down. You and I, we're military. (..)2015 The Martian