Morrinha
nʲibʌɭʃɑja ɡrustʲ ɭʲexkʌja xandrɑ tʌskɑ
In Russian Небольшая грусть, легкая хандра, тоска.
A gentle, quiet sadness or melancholy, often associated with a feeling of being a little bit down or out of sorts.
Example
"Hoje estou com uma morrinha sem motivo."