Amargado means bitter or embittered but this doesn't really give the exact sense of the phrase Estoy amargado (translated here as I am miserable).
The phrases on this site are written as spoken by a man. Some are slightly different when spoken by a woman (see ...). Estoy contento and estoy amargado are examples of this. A woman would say 'estoy amargada' and 'estoy contenta'.
| I am happy | Estoy contento |
| I am miserable | Estoy amargado |
| I am a bit miserable | Estoy un poco amargado |
| to envy | tener envidia |