
Illogical.
The Big Bang Theory Season 5, Episode 20

A fear of heights is ILLOGICAL.
The Big Bang Theory Season 2, Episode 13

I'm so disappointed in myself,
jealousy is completely ILLOGICAL.
The Big Bang Theory Season 10, Episode 9
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"I pity the fool who's ILLOGICAL."
The Big Bang Theory Season 3, Episode 17