How To Add Custom Dictionary in Outlook?

A dictionary is a collection of words that are known or are known to exist in one’s language. A dictionary is a useful tool for anyone learning a language and for students studying a foreign language.

Lookup a word on Outlook and suddenly you have a new dictionary installed for that word. Usually, this happens when a word is misspelled, for example.

A good spell checker can do wonders, but if you use Microsoft Office, Outlook is smart enough to also suggest alternative spellings, words that mean the same thing, or words that are like “the” searched word.

Most of the words still have meaning likely in the different forms of English but do not exist in Dictionary. In such a scenario, you can add or create your customized dictionary.

How to Add word to Outlook Dictionary

Normally when you type a special name/word in an email message, for instance, the mailsmartly in Outlook, it will flag the spelling mistake of mailsmartly with the wavy red line.

mailsmartly in Outlook

It will react that way, Microsoft Outlook won’t recognize special names and technical names, and mark the name and terms as spelling mistakes, until you manually add them into a dictionary.

  • To add a word to your document, click on it and then select Spelling from the popup menu >> Add to Dictionary.
Custom Dictionary In Outlook

How to add the word in Existing Dictionary in Outlook?

Let’s dive in and understand the step-by-step method of how to add the specific word in the custom dictionary in Outlook and also while composing in Microsoft 365, Outlook 2019, 2016, 2013, and 2010.

  • Open Microsoft Outlook Application.
  • Click File >> Options >> Click on Mail from the left navigation section.
  • Click Spelling and Autocorrect button in the Compose messages section.
Add Custom Dictionary In Outlook
  • The next step is to click on Custom Dictionaries which is available in the Editor Options >> Proofing.
Custom Dictionaries

Custom Dictionaries dialog box appears, and you will observe multiple dictionaries already available in the list.

You can edit the list by selecting a specific dictionary, for instance: “RomingCustom.dic (Default)” >> then click Edit Wordlist.

Dictionary In Outlook

Enter the word which causes trouble and hit add and OK. Click Ok until all dialog box closes.


In order to add a word to the custom dictionary in outlook, add it using the “Add” button or press “Ctrl + Shift + Add”. Under the word, click on the “Define” button.

Remove Words using Edit Options

You have already understood two methods above “How to add the specific word” in Outlook Dictionary.

Accidently if you added some misspelled words to the custom dictionary, you could easily remove the word.

  • Click on the file Tab >> Options
  • Shift to the Mail tab and click on Spelling and AutoCorrect.
  • Next to the Edit Options window, click on Custom Dictionaries under the Proofing tab.
  • You need to click on the Edit Word List button from the Custom Dictionaries dialog box.
  • Your custom dictionary opens, and now you can add or remove words accordingly.
Remove Words using Edit Options

To add the specific word, enter the word in the ‘Word(s)’ field and click the ‘Add’ button in case, to remove a word, select it in the ‘Dictionary’ box, and click the ‘Delete’ button.

How To Create and Add Your Own Custom Dictionary in Outlook?

Creating your own custom dictionary is not as simple as that, it’s a process of importing your existing dictionary which you already have on your computer system.

A custom dictionary may be necessary if you want to add multiple words to a Microsoft Outlook application. This tutorial provides the steps needed to create and include a custom dictionary.

Importing dictionary (.dic) file is important:

Let’s begin with how to create a (.dic) file that consists of multiple words.

  • Open Notepad or any other text editor from your computer.
  • Type words one word per line.
  • Once your list is ready, save the file with a .dic extension for instance:(mycustomdictionary.dic)

Now it’s time to upload the file:

  • Click File >> Options in Outlook
  • Click on the Mail option from the left navigation section.
  • Click Spelling and Autocorrect >> Custom Dictionaries
  • From the Custom Dictionaries dialog box, click the Add button.
  • Choose the .dic file from the browser or select the location where you save your above file.
  • Click Ok to finalize.

Final Words

In conclusion, you can create a new dictionary object from Outlook 365, 2019, 2016, 2013 & 2010. For instance, you can create a dictionary of special words or phrases that you use frequently. Overall, it’s worth the effort.

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