kenophasia

“kenophasia
Pronunciation: /ˌken-ō-ˈfā-zh(ē-)ə\

Etymology: A combination of the Greek prefix “keno-“ (meaning “empty” or “void”) and “phasia” (from the Greek “phasis,” meaning “speech” or “utterance”), highlighting the profound emptiness or absence where a word or utterance should reside.

Noun:
A state of utter lexical emptiness, wherein the desired word or phrase is not merely temporarily inaccessible but entirely absent from one’s mental lexicon, leaving a gaping void in one’s understanding.”