If you don’t want Cortana to listen to your activities, you can follow the following steps to disable her, in spite of Microsoft killing all overt options to disabling her.

Windows (key) +R and type regedit, hit enter.

Locate this extension:
HKEY_LOCAL_MACHINE > Software > Policies > Microsoft > Windows > Windows Search

If you can’t seem to locate the Windows Search folder, you can create it via right click Windows Folder (on right pane), select New>Key and name it Windows Search.

While you’ve selected the folder on the right pane, right click on the right navigation pane, and select New>DWORD (32Bit) Value. Name the file, AllowCortana.

Double click it and ensure that the Value Data is set to 0.

Close Regedit and log off and log on.

You should be rid of her but it essentially disables all of Cortana’s all Seeing Eye and her subsequent suggestions. Natural Language searches being one casualty in this removal.