skaf
intransitive verb
to speak with mild scorn or derision (often fol. by at).
He scoffed at my fear of the dark.
Bart blames Milhouse for snitching on him, and when Milhouse says he feared crows pecking at his soul for eternity if he didn’t tell, Bart scoffs at the very notion of having a soul, saying there is no such thing. (http://simpsons.wikia.com/wiki/Bart_Sells_His_Soul)
noun
an expression of mocking disapproval.
Her arrogant boss responded with a scoff when she asked for a raise.