Questions & Answers about Me siento débil hoy.
Because the verb here is sentirse, which means to feel in the sense of to feel a certain way.
- me = myself / I
- siento = I feel
So me siento débil literally means I feel myself weak, which in natural English is I feel weak.
If you say just siento, it usually needs an object or means something different, for example:
- Siento frío = I feel cold
- Lo siento = I’m sorry
But for personal states with an adjective, Spanish very often uses sentirse:
- Me siento bien = I feel well
- Me siento cansado = I feel tired
Siento is the first-person singular present tense form of sentir / sentirse.
The infinitive is sentir = to feel.
Its present tense is irregular because it has a stem change:
So siento means I feel.