Antonyms of adj mirthful

2 senses of mirthful

Sense 1
gay, jocund, jolly, jovial, merry, mirthful -- (full of or showing high-spirited merriment; "when hearts were young and gay"; "a poet could not but be gay, in such a jocund company"- Wordsworth; "the jolly crowd at the reunion"; "jolly old Saint Nick"; "a jovial old gentleman"; "have a merry Christmas"; "peals of merry laughter"; "a mirthful laugh")

INDIRECT (VIA joyous) -> joyless -- (not experiencing or inspiring joy; "a joyless man"; "a joyless occasion"; "joyless evenings")

Sense 2
amusing, comic, comical, funny, laughable, mirthful, risible -- (arousing or provoking laughter; "an amusing film with a steady stream of pranks and pratfalls"; "an amusing fellow"; "a comic hat"; "a comical look of surprise"; "funny stories that made everybody laugh"; "a very funny writer"; "it would have been laughable if it hadn't hurt so much"; "a mirthful experience"; "risible courtroom antics")

INDIRECT (VIA humorous) -> humorless, humourless, unhumorous -- (lacking humor; "it was a humorless wink; a wink of warning"- Truman Capote)

Similarity of adj mirthful

2 senses of mirthful

Sense 1
gay, jocund, jolly, jovial, merry, mirthful -- (full of or showing high-spirited merriment; "when hearts were young and gay"; "a poet could not but be gay, in such a jocund company"- Wordsworth; "the jolly crowd at the reunion"; "jolly old Saint Nick"; "a jovial old gentleman"; "have a merry Christmas"; "peals of merry laughter"; "a mirthful laugh")
       => joyous (vs. joyless) -- (full of or characterized by joy; "felt a joyous abandon"; "joyous laughter")

Sense 2
amusing, comic, comical, funny, laughable, mirthful, risible -- (arousing or provoking laughter; "an amusing film with a steady stream of pranks and pratfalls"; "an amusing fellow"; "a comic hat"; "a comical look of surprise"; "funny stories that made everybody laugh"; "a very funny writer"; "it would have been laughable if it hadn't hurt so much"; "a mirthful experience"; "risible courtroom antics")
       => humorous (vs. humorless), humourous -- (full of or characterized by humor; "humorous stories"; "humorous cartoons"; "in a humorous vein")