crucial (adj.)

• aboriginal
• acute
• basal
• basic
• central
• charged
• clamorous
• compelling
• critical
• crying
• deciding
• decisive
• desperate
• dire
• elemental
• elementary
• embryonic
• emergent
• essential
• exigent
• fundamental
• generative
• genetic
• germinal
• high-pressure
• imperative
• imperious
• important
• insistent
• instant
• loaded
• major
• momentous
• necessary
• original
• pivotal
• pregnant
• pressing
• primal
• primary
• primeval
• primitive
• primordial
• pristine
• radical
• rudimentary
• seminal
• urgent
• vital