Rejecting (10)
There are a few possibilities for this:
snubbing
(Another definition for discarding that I've seen is " Throwing away".)
(Another definition for dismissing that I've seen is " Brushing off".)
'rejecting' is the definition.
(snubbing is a kind of rejecting)
This is the entire clue.
(Another definition for snubbing that I've seen is " Rebuffing, cutting".)