dismissive
adjectiveUK /dɪsˈmɪsɪv/
US /dɪsˈmɪsɪv/
Showing that you think something is not important or not worth your time.
She gave a dismissive wave and walked away.
OTHER MEANINGS
2. Refusing to consider an idea or opinion seriously.
He was dismissive of their suggestions during the meeting.
3. Treating someone as if they do not matter.
The waiter's dismissive attitude made the customers feel unwelcome.
4. Quickly rejecting something without thinking about it.
Her dismissive reply ended the discussion at once.