Synonyms for Deject:

n.

happy, weigh down, oppress, sadden. deject (noun)
cast down, depress, get down, demoralise, dismay, demoralize, dispirit.

v.

deject (verb)
dampen, dishearten, dissuade, daunt, disincline, deter, dismay.
lower spirits (verb)
dishearten, dispirit.
waste (verb)
waste, slop, leak, despoil, excrete.

Other synonyms:

oppress. depress
dispirit.
oppress
sadden.
Other relevant words:
demoralize, depress, demoralise, dispirit, weigh down, oppress, cast down, sadden, get down.