Free of contamination or other additive (4)
I believe the answer is:
pure
(Other definitions for pure that I've seen before include "Unmixed with anything else" , "free of contaminants" , "Unadulterated" , "Virgin" , "free of bad grammar" .)
I believe the answer is:
pure
(Other definitions for pure that I've seen before include "Unmixed with anything else" , "free of contaminants" , "Unadulterated" , "Virgin" , "free of bad grammar" .)