How to Fix Microsoft Word Thesaurus and Spell Check Intermittently Stopping
Question details
The user is experiencing an issue where Microsoft Word's thesaurus and spell check suggestion dialogs stop appearing after the application has been open for some time.
- Product
- Microsoft Word
- Device & OS
- Windows 10
- Scenario
- Using spell check and thesaurus features while editing documents for extended periods in Microsoft Word.
- Observed behavior
- Thesaurus results and spell-check suggestion boxes initially work but stop appearing after Word has been open for a while, though misspelled words remain underlined. Restarting Word restores the features temporarily.
Ensure your work is saved and you have your Microsoft Office product key or account credentials handy, as some advanced troubleshooting steps may require restarting your system or repairing your software installation.
Run Word in Safe Mode to Check for Add-in Conflicts
Starting Word in Safe Mode disables third-party add-ins, which are a common cause of intermittent interface bugs and spell check dialog failures.
Press the Windows key + R simultaneously on your keyboard to open the Run dialog box.
Type 'winword /safe' in the text field and press Enter to launch Microsoft Word in Safe Mode.
Open a document and test the thesaurus and spell check features over a period of time to see if the dialogs eventually stop appearing.
If the features remain stable and functional in Safe Mode, navigate to File > Options > Add-ins to disable suspect COM add-ins one by one until you identify the culprit.
Perform a Clean Boot in Windows
A clean boot starts Windows with a minimal set of drivers and startup programs, helping determine if a background application is interfering with Word's spell check dialogs.
Reset or Reinstall Windows and Office
If standard Office repairs, DISM, and SFC scans fail to resolve the problem, the issue may stem from deep operating system corruption.
Try WPS Office for Reliable and Free Document Editing
If Microsoft Word continues to experience intermittent spell check and thesaurus failures, consider switching to WPS Office. It provides a lightweight, highly compatible, and bug-free writing environment that natively supports all your Microsoft Word documents without requiring expensive subscriptions or complex troubleshooting.
Frequently Asked Questions
Why does spell check only stop working after Word has been open for a while?
This intermittent behavior is often caused by memory leaks, conflicting third-party add-ins, or background applications that gradually interfere with Word's interface rendering over extended editing sessions.
Will repairing Microsoft Office fix the disappearing thesaurus bug?
While an Online Repair of Office fixes many common issues, users report that this specific intermittent bug often persists after standard repairs, suggesting it may be tied to deeper Windows system corruption or software conflicts rather than just damaged Office files.
Does the disappearing spell check issue affect other Microsoft Office applications?
It typically affects Word most prominently due to prolonged document editing sessions. Outlook users generally do not keep individual messages open long enough for the issue to manifest, though Outlook operates on the same underlying Word rendering engine.
How can I quickly get spell check working again without restarting Word?
Unfortunately, once the suggestion dialogs fail to appear, the only known temporary workaround is to save your document, completely close Microsoft Word, and reopen the application to restore the dialog box functionality.
