Isabella’s books contain some words and terms that are no longer in use. One word she regularly used in her books is chirk. For example:
“I’m as chirk as can be,” says Garrett Randall in Doris Farrand’s Vocation.
In Lost on the Trail, Dr. Evarts visits a sick student to “chirk Templeton up a little.”
And in Overruled, Mrs. Bramlett has a long talk with Marjorie and declares, “I feel quite chirked up; it does beat all how you manage to comfort a body!”
In the late 19th and early 20th Centuries, chirk was an informal word for cheer and was mostly commonly followed by the word, up.