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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.