Evernote: How to remove it completely?

From the context of your questions I surmise you want to know not just how to delete the Evernote app from your Mac, but also how to delete all your information from Evernote's records. Assuming that is correct, first log in to your Evernote account and erase all your notes. Then, delete the Evernote app according to Apple's instructions for uninstalling apps.

Although you can deactivate an Evernote account, I don't believe there is a way to permanently delete an account without intervention from their customer support. Merely erasing all your notes from Evernote should accomplish what you seek though.

I saw someone recommend 'AppDelete' and another app, but how can I trust these apps?

You don't. They are unreliable in general. None of them are necessary, and some of them (not App Store programs though) are harmful and will corrupt your Mac.

NewbMacUser wrote:

... Is there an official Apple way to remove apps?

OS X Yosemite: Install, update, and uninstall apps

I'm not sure I understand what it is you intend to accomplish. Earlier, you wrote "I don't want to completely erase Evernote. I just want to remove it completely so I can re-install it again" which contradicts this latest question. Following the above instructions will completely erase Evernote from your Mac.

The reason your notes reappeared after uninstalling Evernote and subsequently reinstalling it again is that your Evernote notes are stored on Evernote's servers. They will remain there until you erase them from Evernote's servers, or Evernote deletes your account. I have no idea if they will do that so all you can do is contact them and ask.

If you don't like Evernote, Apple's Notes is a perfectly suitable equivalent, and it's free.

Please see https://evernote.com/contact/support/kb/#!/article/24422932

You don't need a third-party 'uninstaller' and you should be extremely cautious about these: it's possible for them to get a bit over-enthusiastic.

Presumably it repopulated the notes from the server. The sign-in would probably be in your Keychain, so you could uninstall again and then clear the password from the keychain. But of course doing this and then entering the password manually comes to the same thing anyway. I should leavge it for now and see whether it is behaving itself.

As well as removing the actual program try also trashing these:

(user)/Library/Preferences/ all files beginning with com.evernote

(user)/Library/CoreData/com.evernote.Evernote (folder)

(Apple have hidden the user’s Library folder in Lion and above to casual viewers, in an attempt to stop new Mac users messing their machines up. To access it, in the Finder go to the ‘Go’ menu and hold down the Option (Alt) key; the Library folder will appear as a choice. In Mavericks you can make it permanently visible - open your Home Folder the from the Finder's View menu, choose show View Options and check Show User Library.)

The first link in my post above should be removed as it's the preferences and settings. The second link is the locally cached copy of your notes, so removing it will result in a new installation downloading the notes from the server from scratch (if you delete them I should keep a copy - or in fact just move them somewhere else, just to be on the safe side).

Doing all this should give you a clean reinstall without losing any data. If it's still messing up you'll have to take it up with Evernote support.

That and the other folder I mentioned above. I should just move this folder somewhere rather than delete it, as it contains a copy of your data. If the re-install and re-sync goes OK you can delete it, but until then I should hang onto it just to be on the safe side.

The method I described should have resulted in total removal of the program. Probably the password was still in your Keychain, so when you opened the program it auto logged in. As to the contents, I don't know why you didn't have the cached versions where I said - I can only go by what I see on my Mavericks Mac. In any case I would expect the notes to repopulate from the server when you log in, though this would take a little time. The real question is, is it now working properly? If it isn't, then as I said you should contact Evernote Support.

Do you understand that your notes are stored on Evernote's servers?

Do you understand that your username and password for your Evernote account are stored in your keychain?

Do you understand that deleting the Evernote app does not affect either of the above whatsoever?