Here's how you can stop Google and other search engines from indexing your Pinterest profile. It will take some time after doing this for your Pinterest account to be fully hidden from search engines so be patient. 1. Click your username in the top right on the Pinterest site. 2. Click Edit Profile. 3. Click the checkbox option that hides your account from search engines. 4. Click Save Profile to save your changes.
For more, see the original article at the link below.
Profile and Account Settings | Pinterest