IPA: /dɪsˈdeɪn.fəl.nəs/
KK: /dɪsˈdeɪn.fəl.nəs/
The quality of showing a lack of respect or contempt for someone or something.
Her disdainfulness towards the rude comments was evident in her expression.
Disdainfulness → It is formed from "dis-" (meaning apart or away) and "dais" (from Old French *deis*, meaning to look down upon) and the suffix "-fulness" (meaning the state of being full of). The word describes the state of being full of disdain or looking down upon others.
Think of 'looking down upon' ('dais') and being 'apart' ('dis-') from others, which helps you remember that 'disdainfulness' means being full of disdain.