Someone who is supercilious is-
সঠিক উত্তর
behaving as if you are better than other people
The phrase ‘sine die means
Supercilious (adj):
Bengali meaning: উন্নাসিক
Meaning: behaving as if you are better than the other people
Synonym: arrogant, haughty, disapproving, imperious, pompous, disdainful
Antonym: Humble, modest
Source: Oxford Languages and Samsad Dictionary