I can't say.....

In jpn, we have a word discribing one of sad feeling. This word is "setsunai".

BUT!! I can't find same feeling in English.
This feeling different with sad or sentimental and other words discribing this setsunai feeling. I think it's really original feeling for japanese.

By the way, why am I so sad?(I mean,"setsunai")
What's a reason??
I can't meet him? Is that all? that's it??

I can't say anything my this feeling....