Antonyms of noun synergist

1 sense of synergist

Sense 1
synergist -- (a drug that augments the activity of another drug)
       Antonym of antagonist (Sense 3)
      => antagonist -- (a drug that neutralizes or counteracts the effects of another drug)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun synergist

1 sense of synergist

Sense 1
synergist -- (a drug that augments the activity of another drug)
       => drug -- (a substance that is used as a medicine or narcotic)