Yiddish word for naysayer

Not exactly correct, but a schlemazel is a person who is unlucky all the time.
http://www.thefreedictionary.com/schlemazel

Thanks for your reply @jespah, but I'm looking more for a naysayer or negative-nelly...

I don't know of a word that fits exactly what you're looking for. "Neynzoger" is literally "no-sayer" but means like "one who objects" (not necessarily describing someone who is always like that, just that someone disagrees or dissents). You could make up a word! "Neyn" is "no" and "nit" is "not," while "-nik" is a Slavic suffix that makes something describe a person. If you were to call someone a "Neynik" or "Nitnik," you would be saying that person is defined by their negativity, which I think is what you're trying to convey. I haven't seen either of those used in print but I don't see why they couldn't be and if you did use them I think people would understand what you're talking about.

I should also say that it's common to call someone "Moyshe [something]" in a derisive way, so "Moyshe Neyn" or "Moyshe Nit" might convey what you're looking for too.

Did you find the word you were looking for? I'm looking for the spelling and actual definition of what I'll spell as fuhbbissineh. Its a word used to describe people I'd call negative thinkers.

The 2 dictionaries i checked with say that:

pessimist = פּעסימיסט (pesimist)

defeatist = מאפּאָלעניק (mapoleh-nik)

melancholic = מאָרעשכוירעניק (moreh-shkhoyreh-nik)

farbisine - פארביסענע - is someone bitter, full of anger and hatred toward somebody

Ah, like Frau Farbissina from the Austin Powers movies. My father claims her name means sourpuss.

Sorry for not knowing how to post a new question, so I am going to reply to yours and hopefully someone will help me too:
I am looking for this:
How to say in Yiddish
From your daughter who misses you - in one adjective
I know it's something like
Foon dein benkendigeh tochter
But I'm not sure that that's the correct adjective
I don't want to say "foon dein tochter vos benkt noch dir".
Can anyone please help?
Thank you!

farbissen - someone who is very bitter
farbisseneh - a woman who is very bitter