Someone who is sanctimonious believes they are morally better than others and is quite vocal about it. That person can also be quite hypocritical and may not practise what they preach. - "Stop preaching that holier-than-thou rubbish you sanctimonious fool". - "He was so self-righteous, acting all sanctimonious about how kids behave these days, but he was terrible when he was young". Edited to change mortally to morally.

Meaning of 'sanctimonious' depends on its context. When I try to learn a word, I start to search its originial meaning. The original meaning of 'sanctimonious' is "holy in character". Armed with this inspiration, we move on to analyze it in some context. Here're a lot of sentence examples we can use: https://www.lexico.com/definition/sanctimonious Before the opportunity presents itself for us to use this word 'sanctimonious', we can create some imaginative dialogue to practise using this word.

Thanks, i think my ambiguity is now cleared.👍