Antonyms of adj technical-grade

1 sense of technical-grade

Sense 1
technical-grade, technical grade -- (containing small amounts of other chemicals, hence slightly impure; "technical-grade sulfuric acid")

INDIRECT (VIA impure) -> pure -- (free of extraneous elements of any kind; "pure air and water"; "pure gold"; "pure primary colors"; "the violin's pure and lovely song"; "pure tones"; "pure oxygen")
                                                                         

Similarity of adj technical-grade

1 sense of technical-grade

Sense 1
technical-grade, technical grade -- (containing small amounts of other chemicals, hence slightly impure; "technical-grade sulfuric acid")
       => impure (vs. pure) -- (combined with extraneous elements)