The Sunday evening was spent in repeating, by heart, the Church Catechism, and the fifth, sixth, and seventh chapters of St. Matthew; and in listening to a long sermon, read by Miss Miller, whose irrepressible yawns attested her weariness.
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.