subrational

adjective
sub·​ra·​tio·​nal | \ ˌsəb-ˈrash-nəl How to pronounce subrational (audio) , -ˈra-shə-nᵊl\
variants: or sub-rational

Definition of subrational

: being at a level below what is rational: such as
a : existing or originating below the level of rational thought subrational beliefs/motivations Reason divides men; only subrational sentiment reliably unites them.— Clifford Orwin
b : lacking the ability to reason subrational creatures

First Known Use of subrational

1883, in the meaning defined above

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The first known use of subrational was in 1883

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