Antonyms of adj unfunny

1 sense of unfunny

Sense 1
unfunny -- (not funny; especially failing to achieve the intended humor; "a very unfunny joke")

INDIRECT (VIA humorless) -> humorous, humourous -- (full of or characterized by humor; "humorous stories"; "humorous cartoons"; "in a humorous vein")

Similarity of adj unfunny

1 sense of unfunny

Sense 1
unfunny -- (not funny; especially failing to achieve the intended humor; "a very unfunny joke")
       => humorless (vs. humorous), humourless, unhumorous -- (lacking humor; "it was a humorless wink; a wink of warning"- Truman Capote)