an·ti·thet·i·cal 
(ăn′tĭ-thĕtĭ-kəl) also an·ti·thet·ic (-ĭk)
(ăn′tĭ-thĕtĭ-kəl) also an·ti·thet·ic (-ĭk)adj.
1. Being in diametrical opposition: a viewpoint that was antithetical to conventional wisdom. See Synonyms at opposite.
2. Of, relating to, or marked by antithesis.
[From Medieval Latin antitheticus, from Greek antithetikos, from antitithenai, to oppose; see ANTITHESIS.]
an′ti·theti·cal·ly adv.
- irresponsible
- irresponsibleness
- irresponsibly
- irresponsive
- irresponsively
- irresponsiveness
- irretrievability
- irretrievable
- irretrievableness
- irretrievably
- irreverence
- irreverent
- irreverently
- irreversibility
- irreversible
- irreversibleness
- irreversibly
- irrevocability
- irrevocable
- irrevocableness
- irrevocably
- irrigable
- irrigate
- irrigation
- irrigational