Pejoration is a antonym of amelioration.
As nouns the difference between amelioration and pejoration
is that amelioration is the act of making better while pejoration is the act or process of becoming worse; worsening or degeneration.
amelioration
English
Noun
(
en noun)
The act of making better.
an improvement
Antonyms
* deterioration
pejoration
English
Noun
(
wikipedia pejoration)
(
en noun)
The act or process of becoming worse; worsening or degeneration
(linguistics) The process by which a word acquires a more negative meaning over time
Antonyms
* amelioration