▪ a very temperamental person with an inflated view of their own talent or importance:"the prima-donna behaviour of some of the stars"Similartemperamental personunpredictable personself-important person
Word Originmid 18th century: Italian, literally ‘first lady’.
In opera or commedia dell'arte, a prima donna is the leading female singer in the company, the person to whom the prime roles would be given. Wikipedia