1) Crucially 2) Disapprovingly 3) Fatally 4) Gravely 5) Seriously 1) In a critical manner 
• (adv.) At a crisis; at a critical time; in a situation, place, or condition of decisive consequence; as, a fortification critically situated. • (adv.) In a critical manner; with nice discernment; accurately; exactly.
Crit'ic·al·ly adverb 1. In a critical manner; with nice discernment; accurately; exactly. « Critically to discern good writers from bad. Dryden. » 2. At a crisis; at a critical time; in a situation, place, or condition of decisive consequence; as, a forti...
[adv] - in a critical manner
adverb in a critical manner; `this must be examined critically`