" unappreciation "

 [ "unappreciated" ]

1: Not recognized, as to quality or worth: an unappreciated gesture of good will. Taken for granted.

  * e.g.,  ... He feels unappreciated by her. 

 [ "unappreciative" ]

1: Not valuing something, In particularly from past situation.

  * e.g.,  ... My sister was very unappreciative after all the stuff I bought her, I felt as though I was more betrayed than hurt. 

 [ "Unappreciated Rejection" ]

1: When the friend of someone who is about to or just entered into a new relationship gives their approval or rejection of the partner but is completely ignored by the person and still goes on with the relationship.

  * e.g.,  ... Person 1: "So when do I get to meet her?" Person 2: "Soon why?" Person 1: "So I can give my unappreciated rejection, we both know you're gonna get with her anyway, I just gotta let you know what I think of her"