DISCOURAGEMENT
lose heart
to lose one's courage or confidence.Now, don't lose heart. Keep trying.What a disappointment! It's enough to make one lose heart.
pour cold water on something and dash cold water on something; throw cold water on something
to discourage doing something; to reduce enthusiasm for something.When my father said I couldn't have the car, he poured cold water on my plans.John threw cold water on the whole project by refusing to participate.I hate to dash cold water on your party, but you cannot use the house that night.
bummed (out)
mod. discouraged; depressed.I feel so bummed. I think I need a nice hot bath.When you're feeling bummed out, think how many problems I have.
bummer
n. a disagreeable thing or person.My coach is a real bummer.The game was a bummer you wouldn't believe.
bum someone out
tr. to discourage someone.That darn blow-out bummed me out.The failure of his tires bummed out the race driver.
rain on someone's parade and rain on someone or something
in. to spoil something for someone.I hate to rain on your parade, but your plans are all wrong.She really rained on our parade.