Amargurado means "embittered" or "bitter." It's a strong emotional word that perfectly encapsulates the feeling of deep sorrow and resentment after a heartbreak.
In the context of the song, the singer is expressing the profound pain and bitterness he feels due to a lost love, making it a central theme and a very evocative word for the title.
Have you ever had to say goodbye to someone you still love? "Amargurado" tells the story of a person with a broken heart, or a "peito magoado" (wounded chest), reflecting on a love that has ended. The singer looks back on the "kisses" and "promises" of a relationship that fell apart because his partner dreamed of a "wealth" he could never provide.
Even though he's in pain, the singer's message is surprisingly generous. Instead of being angry, he wishes his ex-lover well, telling her, "Vai com Deus / Sejas feliz com o teu amado" (Go with God / Be happy with your beloved). He even offers his support, promising that if she ever faces failure, he will still be there to help. It's a classic song about loving someone so much that you want them to be happy, even if it's not with you.