The definition of disrespectful is someone or something that shows a lack of deference, courtesy or respect.
A child who talks back to his parents is an example of someone who would be described as disrespectful.
having or showing lack of respect; discourteous; impolite; rude
Having or exhibiting a lack of respect; rude and discourteous.
(comparative more disrespectful, superlative most disrespectful)
- lacking respect
dis- + respectful