so impressive or beautiful that you cannot describe it
This morning I went in search of a word that fit the Valentines Day theme and was one that I didn’t know. Mission accomplished. Now as for the definition . . . I’m not sure I’d use ineffable in my writing since it’s a writer’s job to describe. That said, I can see a character being so in awe of something or someone that the thing or person momentarily defies description. But it’s going to eventually have to be described or the reader will feel gypped. Just sayin’.