Antonyms of adj low-grade

1 sense of low-grade

Sense 1
low-grade -- (of inferior quality)

INDIRECT (VIA inferior) -> superior -- (of high or superior quality or performance; "superior wisdom derived from experience"; "superior math students")

Similarity of adj low-grade

1 sense of low-grade

Sense 1
low-grade -- (of inferior quality)
       => inferior (vs. superior) -- (of low or inferior quality)