What does "humorless" mean?

Lacking humor or levity; serious; not funny, amusing, amused, or lighthearted.

What is a synonym for "humorless"?

Common synonyms include: cheerless, discontented, dour, dry, grave, grim.

adj

adj ·3 syllables ·Uncommon ·Advanced level

Adjective

1
Lacking humor or levity; serious; not funny, amusing, amused, or lighthearted. US
"He watched the little dog's antics with a humorless stare."

Adjective

"Our professor is boring and humorless."

From humor + -less.