Sure, something can be mathematically irrefutably perfect, be it a score in bowling or on the SAT, and something can be categorized as perfect, be it a storm or a game.
But to identify a person or a creative work as perfect is imperfect, because perfection is subjective. Or perhaps unattainable — as the artist Salvador Dali once said, “Have no fear of perfection — you'll never reach it.”
But the late Stan Musial, who was born 100 years ago this weekend, was called “baseball’s perfect warrior … baseball’s perfect knight” by then-commissioner Ford Frick, and that’s a frickin’ perfect description.