Primest

Synonyms for primary/prime
adj best, principal

capital
cardinal
chief
crackerjack
dominant
excellent

first
first-class
heavy
highest
hot
leading

main
number one
paramount
state-of-the-art
stellar
top

tough
fab
greatest
primo
top-of-the-line
world-class

Antonyms for primest

least
minor
subordinate
worst

latest
auxiliary
supplemental
inferior

second-rate
secondary
final

Synonyms
adj earliest

aboriginal
beginning
direct
first

firsthand
immediate
initial
original

pioneer
primal
primeval
primitive

primordial
pristine

Antonyms

least
minor
subordinate
worst

latest
auxiliary
supplemental
inferior

second-rate
secondary
final

Synonyms
adj basic, fundamental

basal
beginning
bottom
central
elemental
elementary

essential
first
introductory
original
primitive
principal

radical
rudimentary
simple
ultimate
underlying
foundational

meat-and-potatoes
underivative
underived
three R’s

Antonyms

least
minor
subordinate
worst

latest
auxiliary
supplemental
inferior

second-rate
secondary
final