Ah, procrastination! The pompous word that is starting to replace laziness. We aren’t lazy anymore, we are procrastinating. Because lazy is an adjective, while procrastinating is a verb.
I’ll go a little bit into grammar (which, I’ll admit it, it might not be my forte). The adjective is used to describe things, while verbs are defined by action. This is why we are more comfortable about saying “I procrastinate” rather than “I’m being lazy”. Lazy will attach us a label, while procrastination is an action that we do, and we can stop it, eventually.