The Collaborative International Dictionary of English v.0.48:
Humorless \Hu"mor*less\, a. Destitute of humor. [1913 Webster]WordNet (r) 3.0 (2006):
humorless adj 1: lacking humor; "it was a humorless wink; a wink of warning"- Truman Capote [syn: humorless, humourless, unhumorous] [ant: humorous, humourous]