From version 14.0 onwards, the path to the setting dialog is slightly different, a General submenu has been added between Editor and Appearance as shown below
IntelliJ 8.1.2 - 13.X
From IntelliJ 8.1.2 onwards, this option is in File | Settings1. Within the IDE Settings section of that dialog, you'll find it under Editor | Appearance.
On a Mac, these are named IntelliJ IDEA | Preferences...
Best Answer
Follow :
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Uncheck the options that you want to disable.Source for more details - Spellchecking with intelliJ