Part of speech: Verb
lower someone's spirits
Example: make downhearted; These news depressed her; The bad state of her child's health demoralizes her
Dismay, Cast down, Get down, Demoralise, Depress
The word "deject" comes from Latin deiciō, which comes from Old French dejeter.
Latin became the scholarly language of Europe for over 1,500 years, standardizing technical vocabulary.