From rejecting +‎ -ly.

rejectingly (comparative more rejectingly, superlative most rejectingly)

1. So as to reject.
   • 2004, Harry T. Reis, Caryl E. Rusbult, Close Relationships: Key Readings, page 544:

     One way of achieving this goal is to select partners who are likely to act rejectingly, such as someone who is unlikely to show sustained relationship satisfaction or commitment.