Quite!

Could “quite” mean completely or not enough in the same phrase? Ex: You’re quite right. Does it depend on the accent? Walter.

Don’t worry, the use of the adverb “quite” can also be confusing for mother-tongue speakers, but in the case of “quite right” the situation is relatively straightforward. If someone says “quite right,” then the meaning is “Absolutely right.” It doesn’t depend on accent or intonation.
When it comes to trying to understand the use of “quite” in English, a general rule of thumb is that if the adjective being qualified by the adverb “quite” is “moderate” (for example, “good,” interesting” etc.), then the meaning is likely to be “abbastanza.” For example, “That’s quite interesting,” “The meal was quite good.” 
If, on the other hand, the adjective is “stronger” or “superlative” (like “brilliant,” “amazing” etc.), then the meaning will be “assolutamente”. For example: “Cate Blanchett’s performance in Blue Jasmine is quite brilliant.”