critically

Concise Oxford English Dictionary © 2008 Oxford University Press:
critical/ˈkrɪtɪkl/

▶adjective

• 1 expressing adverse or disapproving comments or judgements.

• 2 expressing or involving an analysis of the merits and faults of a work of literature or art.

• 3 (of a situation or problem) at a point of crisis.

  ■ extremely ill and at risk of death.

  ■ having a decisive importance in the success or failure of something.

• 4 Mathematics & Physics relating to or denoting a point of transition from one state to another.

• 5 (of a nuclear reactor or fuel) maintaining a self-sustaining chain reaction.

– derivatives
criticality noun,
critically adverb,
criticalness noun.