irruptively

Mary Taylor -- save indeed that Mrs. Holman had the pull, on one's affections, of "coming out" to sing in white satin and quite irrelevantly between the acts; an advantage she shared with the younger and fairer and more dashing, the dancing, Miss Malvina, who footed it and tambourined it and shawled it, irruptively, in lonely state.

A Small Boy and Others Henry James 1879