As they were entering it, the wicked one, who is the author of all mischief, and the boys who are wickeder than the wicked one, contrived that a couple of these audacious irrepressible urchins should force their way through the crowd, and lifting up, one of them Dapple’s tail and the other Rocinante’s, insert a bunch of furze under each.
There are no more uses of "irrepressible" in the book.
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She catches my eye, an irrepressible grin spreading across her face.
Sabaa Tahir -- An Ember in the Ashes
Fitzy’s irrepressible voice is both sarcastic and welcoming, like he just can’t decide which way to go.