Disturbare vs. dare fastidio vs. infastidire

The Italian words 'disturbare', 'dare fastidio', and 'infastidire' all convey the idea of bothering or annoying someone, but they have subtle differences in usage and intensity.

Disturbare

'Disturbare' generally means to disturb, interrupt, or bother someone. It often implies a more serious or significant disruption.
Per favore, non disturbare il tuo fratello mentre studia.
(Please don't disturb your brother while he's studying.)
Mi dispiace disturbarti, ma ho bisogno del tuo aiuto.
(I'm sorry to disturb you, but I need your help.)

Dare fastidio

'Dare fastidio' literally means 'to give annoyance' and is used to express that something or someone is causing irritation or discomfort.
Il rumore del traffico mi fastidio.
(The traffic noise bothers me.)
Se ti do fastidio, dimmelo e me ne vado.
(If I'm bothering you, tell me and I'll leave.)

Infastidire

'Infastidire' is similar to 'dare fastidio' but is often used to describe a more active or intentional act of annoying someone.
Non infastidire tua sorella con quelle domande.
(Don't annoy your sister with those questions.)
Il suo comportamento mi infastidisce molto.
(His behavior really annoys me.)

Summary

While all three words relate to bothering or annoying, 'disturbare' is often used for more serious interruptions, 'dare fastidio' expresses general annoyance or discomfort, and 'infastidire' tends to imply a more active or intentional irritation. Context and personal preference often determine which word is most appropriate in a given situation.