Synonyms of humorless

1 Syllable
staid, dull
2 Syllables
fusty, priggish, prudish, puffy, stodgy, prissy, stilted, pompous, musty, dreary, genteel, bloated
3 Syllables
important, victorian, straitlaced, arrogant
4 Syllables
self-important, conventional, magisterial, narrow-minded
5 Syllables
puritanical, uninteresting