Tired of annoying “red dots” under every single word because your language is not supported by OS X spell‑checker? Here's what to do to completely disable it. System‑wide & for ever.

With macOS 10.11+ (El Capitan) and later, Apple introduced System Integrity Protection (SIP), with which you simply cannot change anything under /System folder – that means the original solution does not work anymore.

So there are three possible ways to go about it (I am currently testing #1):

defaults write -g NSAllowContinuousSpellChecking -bool false

Original source: SuperUser and Reddit

This uses original solution, but with SIP disabled:

See https://www.r-studio.com/data_recovery_macintosh/System_Integrity_Protection.shtml

1. Restart your Mac with Cmd+R pressed.
2. Open Terminal and disable SIP with:

   csrutil disable

3. Restart Mac

To „sabotage“ SpellChecker you need to rename folder containing its resource files. Simply open Terminal and write down:

sudo mv /System/Library/Services/AppleSpell.service/Contents/Resources /System/Library/Services/AppleSpell.service/Contents/Resources.__DISABLED

1. Restart your Mac with Cmd+R pressed.
2. Open Terminal and enable SIP with:

   csrutil enable

3. Restart Mac

See https://web.archive.org/web/20100123201632/http://myrkur.de/thoughts/2008/09/25/disable-spell-checking-os-x/

To disable SpellChecker you need to rename folder containing its resource files. Simply open Terminal and write down:

  cd /System/Library/Services/AppleSpell.service/Contents/
  sudo mv Resources Resources.__DISABLED

Original source of solution: Disable spell check in Mac OSX system-wide (archived)

However, with macOS 10.11+ (El Capitan) and later, Apple introduced System Integrity Protection (SIP), with which you simply cannot change anything under /System folder.

1. Go to System Preferences → Keyboard → Text
2. Untick “Correct spelling automatically”
3. From Spelling dropdown, choose “Set up” and select any single language you do not use
4. Confirm, go back and select “Automatic by language” from dropdown menu

Original source of solution: https://discussions.apple.com/thread/2577594?tstart=0

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