From the Wordsmith: "Procrastinator"—are you one?

According to vocabulary.com, “A procrastinator is a person who delays or puts things off—like work, chores, or other actions—that should be done in a timely manner.”

Even if the word may not ring a bell, the linked behaviour should be something familiar. Procrastinators are no strangers.

Find it too intellectual or medical? How about “loafer” or “idler”? What is the antonym? We like "closer". What do you think?