tantalizing
                  // also spelled tantalising
1. Something that is tantalizing is very attractive and tempting, especially because you know that it is not possible to have it.
    This raises the tantalizing possibility that there may be life on other stars.
  ADJ

tantalizingly
1. Sometimes a new idea may be tantalizingly close.
 ADV

tantalize
              // tantalizes, tantalizing, tantalized
              //also spelled tantalise.
1. If something or someone tantalizes you, they make you feel hopeful and excited, and then do not allow you to have what
    you want.
  VB WITH OBJ