Antonyms of adj gram-positive

1 sense of gram-positive

Sense 1
Gram-positive -- ((of bacteria) being or relating to a bacterium that retains the violet stain used in Gram's method)

INDIRECT (VIA positive) -> negative, disconfirming -- (not indicating the presence of microorganisms or disease or a specific condition; "the HIV test was negative")

Similarity of adj gram-positive

1 sense of gram-positive

Sense 1
Gram-positive -- ((of bacteria) being or relating to a bacterium that retains the violet stain used in Gram's method)
       => positive (vs. negative), confirming -- (indicating existence or presence of a suspected condition or pathogen; "a positive pregnancy test")