IPA: /ɪˈrɛvərənt/
KK: /ɪˈrɛvərənt/
Not showing respect for things that are usually taken seriously; often humorous or satirical.
The comedian's irreverent jokes made the audience laugh, even about serious topics.
Irreverent is formed from "ir-" (meaning not) and "reverent" (from Latin "reverentem", meaning to show respect or awe). The word describes a lack of respect or seriousness, particularly towards things that are generally taken seriously.
Think of 'not' ('ir-') showing 'respect' ('reverent') — that's why irreverent means lacking respect.