Select the pasted text—or the entire destination document—and reapply its proofing language, because Word can preserve language and spell-check attributes when text is copied between documents.
Reset proofing for the pasted text
- In the destination document, select the pasted text.
- To correct the entire document, press Ctrl+A.
- Go to Review → Language → Language → Set Proofing Language.
- Select the language actually used in the document, such as English (United States).
- Clear Do not check spelling or grammar.
- If its box is shaded or filled rather than checked, the selection contains mixed settings; click it until the box is completely empty.
- If Detect language automatically is assigning the wrong language, clear it and explicitly select the correct language. Automatic detection can misidentify short or ambiguous text.^1^
- Select OK—not Set as Default.
- Type an obvious test error such as
speling, then open Review → Editor or press F7.
Word stores the proofing language as an attribute of the text, much like formatting. Consequently, copied text can retain a different language or the Do not check spelling or grammar attribute even when the destination document otherwise checks spelling correctly.^2^ A matching case in which copied text remained unchecked was resolved by selecting everything, clearing Do not check spelling or grammar, and disabling automatic language detection.^3^
If no text in the document is being marked
Check the document-level settings:
- Open File → Options → Proofing.
- Under When correcting spelling and grammar in Word, enable:
- Check spelling as you type
- Mark grammar errors as you type
- Under Exceptions for, select the affected document.
- Clear:
- Hide spelling errors in this document only
- Hide grammar errors in this document only
- Select OK, reopen the document, and run Review → Editor.
If the required language is not available in Set Proofing Language, it must first be enabled in Office; some languages also require the corresponding proofing tools or language pack.^1^
References
- Troubleshoot checking spelling and grammar in multiple languages | Microsoft Support
- why is my spelling and AutoCorrect not working - Microsoft Q&A
- Spellcheck Not Working and Frustrating - Microsoft Q&A