- critical ► ADJECTIVE 1) expressing adverse or disapproving comments or judgements. 2) expressing or involving an analysis of the merits and faults of a literary or artistic work. 3) having a decisive importance in the success or failure of something; crucial. 4) extremely ill and at risk of death. 5) Mathematics & Physics relating to a point of transition from one state to another. 6) (of a nuclear reactor or fuel) maintaining a self-sustaining chain reaction.DERIVATIVES critically adverb.
English terms dictionary. 2015.