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- And brave as he might be, it was that sort of bravery chiefly, visible in some intrepid men, which, while generally abiding firm in the conflict with seas, or winds, or whales, or any of the ordinary irrational horrors of the world, yet cannot withstand those more terrific, because more spiritual terrors, which sometimes menace you from the concentrating brow of an enraged and mighty man.Chapters 25-27 -- Postscript; Knights and Squires; Knights and Squires (34% in)
There are no more uses of "irrational" in Moby Dick.
Typical Usage (best examples)