A pause succeeded, during which the honest and irrepressible baby made a series of leaps and crows at little Jane, who appeared to me to be the only member of the family (irrespective of servants) with whom it had any decided acquaintance.
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.