In 19th-century classical music the seventh chord was generally the upper limit in "chordal consonance", with 9th and 11th chords being used for "extra power" but invariably with one or more notes treated as appoggiaturas.
In North American English, such words (if singular in form) are invariably treated as singular.
Despite his age he was invariably treated as a dogsbody by Del and Rodney, often being assigned mundane jobs around the flat such as cooking meals.
Outsiders were invariably treated with either derision or suspicion or both.
I am invariably treated like an irresponsible five-year-old, not to be trusted, and at times 'things' become rather heated.
A church worker is distressed that the homeless are invariably treated as objects, not as individuals.
The herbalist David Winston points out that appendicitis is regularly treated by herbs and acupuncture in China, whereas in the United States, it is invariably treated by surgery.
Similarly in Sephardic Hebrew a shewa following a syllable with a long vowel is invariably treated as vocal.
But as long as my wavelength was peaceful, I was invariably treated like clan.
My young boss, Siegfried Far non, a man not easily overawed, invariably treated him with deference a in fact the visit was something of a state occasion.