Someone who is volatile is -
সঠিক উত্তর
liable to display rapid changes of emotion
The phrase ‘sine die means
ব্যাখ্যা: Volatile (adjective)
Meaning: liable to change rapidly and unpredictably, especially for the worse
Bengali Meaning: অস্থির
Synonym: evaporative, vaporous, unstable, labile
Antonym: stable, calm