His was an involuntary confidence, an irrepressible effusion to a soothing friend—not an application to a parent.
"— Elinor could have given her immediate relief by suggesting the possibility of its being Miss Morton’s mother, rather than her own, whom they were about to behold; but instead of doing that, she assured her, and with great sincerity, that she did pity her—to the utter amazement of Lucy, who, though really uncomfortable herself, hoped at least to be an object of irrepressible envy to Elinor.
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.