Wiktionary
unhumorous
a. Not humorous.
WordNet
unhumorous
adj. lacking humor; "it was a humorless wink; a wink of warning"- Truman Capote [syn: humorless, humourless] [ant: humorous]
Usage examples of "unhumorous".
Plump, prosperous, wearing a pleasant but quite unhumorous smile, Theron G.