Spanish phrase
No me convence.
Meaning
I'm not convinced.
When to use it
Expresses doubt or lack of agreement. Used to politely register reservations about someone's suggestion and often to propose a known alternative.
Example dialogue
¿Vamos al nuevo restaurante esta noche?
Shall we go to the new restaurant tonight?
No me convence, prefiero ir a uno que conozcamos.
I'm not convinced, I'd prefer to go to one we know.