How do I unlearn a word? I have accidentally learned 'formating'.

I've tried unlearning by right-click, and have removed the word from the /Library/Spelling and ~/Library/Spelling directories. 

The word is still not underlined in red when I type it on various apps.

Is there any way to make sure the word is unlearned? 

Pages recognises the word as incorrect, but not TextEdit or Google Chrome.
As a workaround: add the correction to your Keyboard prefs.

SysPrefs &gt; Keyboard &gt; Text

formating --&gt; formatting


I know it's not the real solution you want, but perhaps helps in the mean time.