All 5 Uses

irrational
in
Hush, Hush
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I felt an irrational need to defend myself and decided right then and there I wouldn't back down until he did.†
p. 14.6 *

irrational = unreasonable
I knew I was being irrationally irate.†
p. 301.4

irrationally = in a manner that is not reasonable
The most irrational part of all was that I still didn't want to believe he would kill me, and no matter how hard I tried, I couldn't smother that illogical speck of trust.†
p. 301.5

irrational = unreasonable
I hated myself for experiencing irrational pangs of jealousy.†
p. 337.5
Hearing Jules talk about Patch's love filled me with irrational hope.†
p. 365.1

Definitions:

(1) (irrational)
not reasonable
(2) (meaning too rare to warrant focus)
More rarely, irrational numbers in mathematics are numbers that cannot be expressed as a fraction consisting of only an integer in the numerator and denominator. For example, pi is an irrational number while 1/3 is rational.