What is the antonym for word reference?

There isn't one single perfect antonym for "word reference," as it depends on what aspect you want to contrast. However, depending on the context, some possibilities include:

* Definition absence: If you mean the *lack* of a word's definition, then an antonym could be something like undefined, unlisted, or unrecorded.

* Lack of explanation: If you are referring to the explanation of a word's meaning, an antonym could be misunderstanding, misinterpretation, or confusion.

* Absence of a source: If "word reference" refers to a dictionary or thesaurus, an antonym could be no source, unverified, or original (in the sense of not being based on any prior source).

The best antonym will depend heavily on the specific sentence in which "word reference" is used.