1. in a manner lacking humor, wit, or amusement; without making or appreciating jokes
Usage: chiefly British spelling; American English typically uses 'humorlessly'

Examples

• He stared humourlessly at the comedian's jokes, showing no sign of amusement.
• She delivered the punchline humourlessly, which somehow made it funnier.
• The speaker continued humourlessly through the presentation despite the audience's laughter.
• He responded humourlessly to her attempt at a joke.
• The film's tone was humourlessly bleak throughout.