1. the quality or state of being impossible to define or describe precisely
Usage: abstract noun; formal register

Examples

• The indefinableness of her charm made her unforgettable to everyone who met her.
• Critics struggled with the indefinableness of the artist's style, which blended multiple genres.
• There is an indefinableness to the feeling you get when walking through an old forest.
• The indefinableness of quantum mechanics continues to puzzle physicists.
• He tried to capture the indefinableness of the moment in his poetry.