Synonyms for Discourage:

n.

wear down, alarm, cast a shadow over something, let down, get down, throw/pour cold water on something, dash someone's hopes. persuasion. discourage (noun)
warn, monish, admonish, deter.

v.

de-motivate (verb)
paralyze, frustrate, stifle, de-motivate, curb, hamper, hinder, throttle, impede.
deter, dissuade; restrain (verb)
impede, prevent, withhold, keep back, divert, hold off, inhibit, curb, hinder, warn, disincline, obstruct, check, quiet, turn aside, control, hold back.
disappoint (verb)
disappoint, thwart, disillusion, dash, disconcert.
dishearten, dispirit (verb)
cow, alarm, depress, bully, daunt, demoralize, frighten, dash, dismay, confuse, dampen, cast down, prostrate, intimidate, unnerve, scare, beat down, deject, repress, chill.
dissuade (verb)
dampen, admonish, dishearten, ban, depress, deter, dissuade, deflect, disincline, chill, daunt, bar, inhibit, divert, restrain, prevent, avert, derail, intimidate, check.
frighten (verb)
unnerve.

Other synonyms:

hold off, wear down, prohibit, dispirit, obstruct. avoid, frighten. cast down. let down, squash. stop. depress
cast down, beat down, dispirit.
dispirit
demoralize.
prohibit
bar.

Usage examples for discourage

  1. Do not discourage them. – The Young Man and the World by Albert J. Beveridge
  2. It was not sufficient, however, to discourage him, and he immediately tried again, and he continued to try for three- quarters of an hour. – Edison, His Life and Inventions by Frank Lewis Dyer and Thomas Commerford Martin