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. Someone aromantic people may feel as though they never had really felt romantic attration in the first place, however a voidromantic person may feel like there is a place where romantic attraction would or should be but is simply unable to experience it.
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].