Plain
As an adjective
Specifically meaning from additions and additives…
Or pure.
Absolute
Clarified
Concentrated
Filtered
Fine
Fresh
Full bodied
Neat
Pure
Purified
Refined
Rendered
Straight
Strong
Taintless
Tried
unadulterated
Unalloyed
Uncombined
Uncontaminated
Uncorrupt
Undefiled
Undiluted
Unpolluted
Untainted