1. (adjective) of extreme importance; vital to the resolution of a crisis

• important

2. (adjective) of the greatest importance

• all important
• all-important
• essential
• of the essence

1. (adjective) of extreme importance; vital to the resolution of a crisis

• critical
• decisive
• essential

1. (adjective) of extreme importance; vital to the resolution of a crisis

• critical
• decisive
• life-and-death
• life-or-death
• pivotal
• polar

2. (adjective) having crucial relevance

• material

3. (adjective) of the greatest importance

• important
• of import

1. (adjective) of extreme importance; vital to the resolution of a crisis

• criticality
• criticalness
• cruciality
• importance

2. (adjective) of the greatest importance

• center
• centre
• core
• essence
• gist
• heart
• heart and soul
• inwardness
• kernel
• marrow
• meat
• nitty-gritty
• nub
• pith
• substance
• sum
• criticality
• criticalness
• cruciality
• essentiality
• essentiality
• essentialness
• essentialness

1. (adjective) of extreme importance; vital to the resolution of a crisis

• noncrucial