Use "undefinable" in a sentence

1. However, people also use "Agender" to mean identifying as gender-neutral or having an undefinable gender.

2. However, people also use "Agender" to mean identifying as gender-neutral or having an undefinable gender

3. Chateaubriand (pronounced "sha-toe-bree-AHN") is a culinary term, which, like Delmonico steak, manages to convey meaning while remaining all but undefinable