Cheerfulness is a related term of imperturbability.
As nouns the difference between cheerfulness and imperturbability
is that cheerfulness is the state of being cheerful; joy while imperturbability is a state of calm, unruffled self-assurance; aplomb, composure.
cheerfulness
English
Noun
(-)
The state of being cheerful; joy.
imperturbability
English
Noun
(-)
A state of calm, unruffled self-assurance; aplomb, composure.
Related terms
* imperturbable