Tending to cause sadness or low spirits
Dark and depressing
"Who are those men, and why do their faces look so joyless?" asked the prince.
There are various theories as to what exactly makes this sort of Scot so embittered and joyless.
Also his job (teacher) gives him a rather joyless look which is expunged on the rare occasions of a smile.
His approach paid dividends in Hal's confrontations with his equally joyless father.
I am gathered here singing your praises and considering how, for the most part, my singing has become so joyless.