subrational

adjective

sub·​ra·​tio·​nal ˌsəb-ˈra-sh(ə-)nəl 

variants or sub-rational

: 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

Word History

First Known Use

1883, in the meaning defined above