an·​ti-ra·​tio·​nal | \ˌan-tē-ˈrash-nəl, -ˈra-shə-nᵊl, ˌan-tī-\
variants: or antirational

Definition of anti-rational 

: opposed or contrary to what is rational : deliberately or utterly irrational anti-rational thinking/behavior

Other Words from anti-rational

anti-rationalism or antirationalism \ˌan-​tē-​ˈrash-​nə-​ˌli-​zəm, -​ˈra-​shə-​nə-​ˌli-​, ˌan-​tī-​ \ noun
A cultural history of the past 40 years, the book focuses on the convergence of social forces … that have created a perfect storm of anti-rationalism. The Washington Times
anti-rationalist or antirationalist \ˌan-​tē-​ˈrash-​nə-​list, -​ˈra-​shə-​nə-​list, ˌan-​tī-​ \ adjective
anti-rationalist theories
anti-rationalist or antirationalist noun
… since it is quite possible to reduce one's use of evidence and logic in certain contexts, it is not necessarily futile for anti-rationalists to urge that everyone should do this every time they disagree with what anti-rationalists believe. — Michael Albert
anti-rationality or antirationality \ˌan-​tē-​ˌra-​shə-​ˈna-​lə-​tē, ˌan-​tī-​ \ noun
It wasn't enough to reject the old approaches; a kind of antirationality gripped American business. — Barbara Ehrenreich

First Known Use of anti-rational

1749, in the meaning defined above

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The first known use of anti-rational was in 1749

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