critical (urgent) / critical (of great importance) / critical (related to criticism) / judgemental

criticism / review, usually written / reason; logic

critic (profession)

it's easy to criticize; those who say it cannot be done should not interrupt those doing it

(uncountable) ability to think critically, critical thinking / (countable) critical mind, analytical mind / (countable) critical person

(physics) critical mass (amount of fissile material needed to support a self-sustaining nuclear chain reaction)

source criticism