crucial /krooˈshəl/

1. Testing or decisive
2. Essential, very important
3. Very good (slang)
4. Crosslike
5. Of the nature of a crux

cruˈcially adverb

• monk's seam
• mono
• mono-
• monoacid
• monoamine
• monoamine oxidase
• monoamine-oxidase inhibitor
• monoamines
• monobasic
• monoblepses
• monoblepsis
• monobloc
• monobrow
• monobrows
• monocardian
• monocarp
• monocarpellary
• monocarpic
• monocarpous
• monocarps
• monoceros
• monoceroses
• monocerous
• monochasia
• monochasial