primordial (adj.)

• aboriginal
• ancestral
• atavistic
• autochthonous
• basal
• basic
• central
• crucial
• elemental
• elementary
• embryonic
• fundamental
• generative
• genetic
• germinal
• original
• patriarchal
• pregnant
• prehistoric
• primal
• primary
• prime
• primeval
• primitive
• pristine
• radical
• rudimentary
• seminal