Morrinha
sɯɫsɯɫhɐm ɛssjuːlsjuːləm ləʊnlinəs ɔː uuɫhɐm uːləm dɪpɹɛʃən bʌt nɒt ðə spəsɪfɪk njuːəns ɒv dʒɛntəl sadnəs
In Korean 쓸쓸함 (sseulsseulham) - loneliness; or 우울함 (uulham) - depression, but not the specific nuance of gentle sadness.
A feeling of slight melancholy, a gentle sadness, or a longing, often associated with a soft, drizzling rain.
Example
"Sinto uma morrinha hoje, o tempo está cinzento."