I have learned 'quite' generally has 2 meanings: 1. completely 2. fairly
So, 'quite tired' means 'fairly(or pretty) tired' while 'quite exhausted' means 'completely tired" (according to Practical English Usage by Swan).
What I don't understand, however, is how we can tell which meaning was used in a certain sentence. This book explains using the term 'non-measurable vs measurable, but I still don't get this.
Thanks for your trouble.
By the way, I don't think that "Thanks for your trouble" is a correct sentence" here.