adj.
1.marked by a tendency to find and call attention to errors and flaws
2.at or of a point at which a property or phenomenon suffers an abrupt change especially having enough mass to sustain a chain reaction
3.characterized by careful evaluation and judgment
4.urgently needed
5.forming or having the nature of a turning point or crisis
6.being in or verging on a state of crisis or emergency
7.of or involving or characteristic of critics or criticism