From the Latin pejor 'meaning worse' to the Late Latin pejoratus meaning 'to become worse' or 'to make worse'. 

More commonly you might hear the word pejorative used.  It can be either or noun or adjective. 
It also comes from pejor 'meaning worse' to Late Latin pejorare 'to make worse' to French pejoratif, which in the late 19th century became pejorative 

pejorative means to express contempt or disapproval - synonyms for pejorative are disparaging, derogatory, deprecatory. 
Pejorative in a sentence:  The team captain came under fire for making pejorative comments about his/her teammates.