ir·ra·tio·nal
i-ˈra-sh(ə-)nəl
ˌi(r)-
: not rational: such as
a(1)
: lacking usual or normal mental clarity or coherence
(2)
: not endowed with reason or understanding
b
: not governed by or according to reason
irrational fears
c
Greek and Latin prosody
(1)
of a syllable
: having a quantity other than that required by the meter
(2)
of a foot
: containing such a syllable
d(1)
: being an irrational number
an irrational root of an equation
(2)
: having a numerical value that is an irrational number
a length that is irrational
1
: an irrational being
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Merriam-Webster unabridged
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