Definition of antithetical

< antithesis

antitoxic >

an·ti·thet·i·cal    (nt-tht-kl) KEY  also an·ti·thet·ic  (-k) KEY 

ADJECTIVE:

1. Of, relating to, or marked by antithesis.
2. Being in diametrical opposition. See Synonyms at opposite.

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ETYMOLOGY:
From Medieval Latin antitheticus, from Greek antithetikos, from antitithenai, to oppose ; see antithesis

OTHER FORMS:
anti·theti·cal·ly(Adverb)