Scornful means showing that you think something is beneath consideration. Not arguing with it — dismissing it.
It takes of. The word describes looks, laughs and remarks, so a scornful laugh and a scornful dismissal are both standard. It sits close to contemptuous, and scorn is perhaps a shade more openly expressed than contempt. Pouring scorn on something is the fixed phrase for public ridicule. The adverb scornfully is common in dialogue tags.
1adjectivescornfulShowing open contempt for something.
“She was scornful of every excuse he offered.”
Middle English
scornful
English, today
scornful
From Middle English scornful. Middle English scornful; equivalent to scorn + ful.
Etymology from Wiktionary, CC BY-SA