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.
There are no more uses of "irrational" in the book.
Show samples from other sources
Irrational thoughts started swimming through his mind—he wanted to jump up and attack, beat him like he’d beaten Gaily after escaping the Maze.
James Dashner -- The Scorch Trials
He’d held his temper—he hadn’t done anything too impulsive or irrational.