pejorative (adj.)
"depreciative, disparaging," 1888, from French péjoratif, from Late Latin peiorat-, past participle stem of peiorare "make worse," from Latin peior "worse," related to pessimus "worst," pessum "downward, to the ground," from PIE *ped-yos-, comparative of root *ped- "to walk, stumble, impair" (see peccadillo). As a noun from 1882. English had a verb pejorate "to worsen" from 1640s.