As nouns the difference between bitterness and spitefulness
is that bitterness is the quality of having a bitter taste while spitefulness is (uncountable) the state or quality of being spiteful.
bitterness
English
Noun
the quality of having a bitter taste
the quality of feeling bitter; acrimony, resentment
Synonyms
* (quality of being bitter in taste) acerbicness, acridity, acridness
* (quality of feeling bitter) acrimony, gall, rancor/rancour, resentment
spitefulness
English
Noun
(uncountable) The state or quality of being spiteful.
(countable) The result or product of being spiteful.
Synonyms
* nastiness
* hatefulness
* maliciousness
* malevolence
See also
* ill will
* hostility