The Colonel was perhaps unaware that he had coerced his own wife into her grave. (not reviewed by editor)
How did he seemógrave, or gay, or how? (not reviewed by editor)
And he related the story of Alcee Arobin and the consul's wife; and another about the tenor of the French Opera, who received letters which should never have been written; and still other stories, grave and gay, till Mrs. Pontellier and her possible propensity for taking young men seriously was apparently forgotten. (not reviewed by editor)
Samples from Other Sources
Her smile disappeared as she suddenly realized the gravity of her situation.
assumed the gravity of a judge and said...
the cold insipidity of Lady Middleton was so particularly repulsive, that in comparison of it the gravity of Colonel Brandon, and even the boisterous mirth of Sir John and his mother-in-law was interesting.
Jane Austen -- Sense and Sensibility
I have grave doubts.
Bram Stoker -- Dracula
I roused the five of you because we are all in grave danger.