All 6 Uses

irrational
in
The Wide Window
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There are two kinds of fears: rational and irrational—or, in simpler terms, fears that make sense and fears that don't.†
p. 30.3 *

irrational = unreasonable
But if they were afraid of lemon meringue pie, this would be an irrational fear, because lemon meringue pie is delicious and has never hurt a soul.†
p. 30.5
Being afraid of a monster under the bed is perfectly rational, because there may in fact be a monster under your bed at any time, ready to eat you all up, but a fear of realtors is an irrational fear.†
p. 30.8
Besides occasionally wearing an ugly yellow coat, the worst a realtor can do to you is show you a house that you find ugly, and so it is completely irrational to be terrified of them.†
p. 30.9
As Violet, Klaus, and Sunny looked down at the dark lake and thought about their new lives with Aunt Josephine, they experienced a fear themselves, and even a worldwide expert on fear would have difficulty saying whether this was a rational fear or an irrational fear.†
p. 31.4
On one hand, this was an irrational fear, because Aunt Josephine seemed like a good person, and Count Olaf was nowhere to be seen.†
p. 31.6

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.