Voidromantic is an aro-spec orientation where one's orientation feels hollow or it feels like a void where one's romantic orientation should be. It is similar to the difference between agender and gendervoid. An aromantic person may also feel as though they never had a romantic orientation in the first place, however a voidromantic person may feel like there is a place where a romantic orientation would or should be but isn't.
The sexual equivalent is voidsexual.
History
Voidromantic and voidsexual were coined on or before February 17, 2015 by Tumblr user Y0suke through MOGAI-Archive[1].