(the) most attractive/important/popular, etc.
A2
used before an adjective to show that someone or something has the greatest amount of a quality
Dictionary examples:
This is the most boring class ever. I'm falling asleep! (0.0)
This is the most difficult game I've ever played! (0.0)
This is the most exciting day of my life! (0.0)
She chose the most expensive coat in the shop. (11.6)
Of the four, he's the most likely to win. (16.5)
She's the most beautiful girl I've ever seen. (16.7)