Examples from the Web for undemonstrative
Dream dates come knocking, and undemonstrative mates mount quite a show of affection.
"I only wanted to say that he is undemonstrative," explained the girl, flaming red.A Man of Two Countries|Alice Harriman
Mrs. Agin was an undemonstrative old woman but she bent now and kissed Rosie on the forehead.The Rosie World|Parker Fillmore
It was as near to a caress as his undemonstrative nature could approach.When 'Bear Cat' Went Dry|Charles Neville Buck