She was persuaded that irrepressible passion was the cause of his impatience; and being an ardent admirer of impulsiveness (when it did not lead to the spending of money) she always received him with a genial twinkle of complicity and a play of allusion to which May seemed fortunately impervious.
There are no more uses of "irrepressible" in the book.
Show samples from other sources
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.