irrationalism
Concise Oxford English Dictionary © 2008 Oxford University Press:
irrationalism/ɪˈraʃ(ə)n(ə)lɪz(ə)m/
▶noun a system of belief or action that disregards rational principles.
– derivatives
irrationalist noun & adjective.
irrationalist noun & adjective.
'irrationalism' also found in these Oxford entries:

