IPA: /ˌdɪsˈrɛspɛktfəli/
KK: /dɪsˈrɛspɛktfəli/
In a way that shows a lack of respect or consideration for someone or something.
He spoke disrespectfully to his teacher, which upset her.
Disrespectfully → It is formed from "dis-" (meaning apart or away) and "respect" (from Latin "respectus", meaning regard or consideration) and "-fully" (meaning in a manner full of). The word "disrespectfully" means in a manner that shows a lack of regard or consideration for someone or something.
Think of 'dis-' meaning apart and 'respect' meaning regard — when someone acts disrespectfully, they are showing a lack of regard.