disable spell check box.

I'm want my spreadsheet to go through words that will be imported in the first column and delete all those words that are misspelled. The primary line of code I'm using is this:

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The line works as expected. However, for every misspelled word, the 'Spelling' box pops up that indicates the word is mispelled and pauses my code between each word.

I need to disable this box and prevent it from popping up but I can't figure out how to do it. Any ideas?