Almost subconsciously, she passionately longs after something undefinable. They are a band that's undefinable but always recognizable. With "u" as the reals, these missing elements would correspond to undefinable numbers. According to Marjorie Garber, this quality is "the undefinable extra something that makes a star". He called it an "undefinable music-beast". This, it is true, at present is an undefinable area. This represents a change in Shakespeare's view that love is completely undefinable. Also, the cell-based manufacturing process of biologics results in undefinable post-translational modifications.