Wiktionary
humorlessly
adv. In a humorless manner; lacking levity or humor.
WordNet
humorlessly
adv. in a humorless manner; "he reacted rather humorlessly to these rumors" [syn: humourlessly, without humor, without humour] [ant: humorously]
Usage examples of "humorlessly".
Besides,” the countess chuckled humorlessly, “not even she can kill off the entire Government.
McKee's confirmation was soft, and Ferrero smiled humorlessly at the com officer's tone.
Fenring didn't much care for her personality, but she was a good worker and tended to his needs, albeit humorlessly.