Joylessness is a synonym of mirthlessness.
As nouns the difference between joylessness and mirthlessness
is that joylessness is the state or condition of being joyless; lack of joy; unjoy while mirthlessness is the state or condition of being mirthless.
joylessness
English
Noun
(-)
the state or condition of being joyless; lack of joy; unjoy.
Synonyms
* anhedonia
* unjoy
mirthlessness
English
Noun
(-)
The state or condition of being mirthless.
Synonyms
* cheerlessness, infestivity, joylessness