1. the quality or state of lacking humor; absence of the ability to appreciate or express what is funny or amusing
Usage: uncountable noun; formal register

Examples

• The humourlessness of his presentation made it difficult for the audience to stay engaged.
• Her humourlessness in social situations often left her feeling isolated from her peers.
• The film was criticized for its heavy-handed dialogue and overall humourlessness.
• Despite the humourlessness of the meeting, a few people managed to smile at the irony.
• His humourlessness was not a character flaw but simply a reflection of his serious personality.
• The humourlessness of the corporate training video put everyone to sleep.