Mrs. van der Luyden’s attitude said neither yes nor no, but always appeared to incline to clemency till her thin lips, wavering into the shadow of a smile, made the almost invariable reply: "I shall first have to talk this over with my husband."
Poor Medora, repeatedly widowed, was always coming home to settle down (each time in a less expensive house), and bringing with her a new husband or an adopted child; but after a few months she invariably parted from her husband or quarrelled with her ward, and, having got rid of her house at a loss, set out again on her wanderings.
There are no more uses of "invariably" in the book.
Show samples from other sources
I tell myself to go to sleep early, but I invariably end up watching television late into the night.
You better tell her we’re starting earlier. She’s invariably late.