In BrE, quite has two meanings. With gradeable adjectives it means 'fairly',
and with ungradeable or "extreme" adjectives it means 'completely'.
AmE does not make this distinction. For AmE speakers, quite is an intensifier
with a meaning similar to 'very'. This explains JillN's response.
https://forum.wordreference.com/threads/its-quite-amazing.3959817/
#post-20283265