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ultra-rationalism
ultra-rationalism n. 
/ˌʌltrəˈraʃn̩l̩ɪz(ə)m/, /ˌʌltrəˈraʃənl̩ɪz(ə)m/, /ˌʌltrəˈraʃ(ə)nəlɪz(ə)m/, /ˌəltrəˈræʃnəˌlɪz(ə)m/
Brit. /ˌʌltrəˈraʃn̩əlɪz(ə)m/
, /ˌʌltrəˈraʃn̩əlɪz(ə)m//ˌʌltrəˈraʃn̩l̩ɪz(ə)m//ˌʌltrəˈraʃənl̩ɪz(ə)m//ˌʌltrəˈraʃ(ə)nəlɪz(ə)m/U.S. /ˌəltrəˈræʃənlˌɪz(ə)m/
, /ˌəltrəˈræʃənlˌɪz(ə)m//ˌəltrəˈræʃnəˌlɪz(ə)m/ΚΠ
1899 W. S. Churchill Let. 19 Jan. in R. S. Churchill Winston S. Churchill (1969) II. Compan. i. p. xxvii Who should draw the line where the maximum of human pain and doubt may be allayed and the minimum of ultra-rationalism be incurred?
1946 Mind 55 109 This ultra-rationalism, as I may call it, put forward by Leibniz.
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