Somewhere in grade school, I learned that some adjectives are not subject to comparison. Unique means one of a kind, so if you and I are both unique, you cannot be more or less unique than I. People often take unique to mean unusual.
A couple other examples are anniversary and desperate. How often do we hear of the one-month or six-month or the one-year anniversary of an event? However, an anniversary by definition is an annual event. And desperate, I learned, means without hope. We will conduct a desperate search for survivors, by which we mean anxiety-filled. If it were literally a desperate search, then hope would be gone and the search pointless.
Oh yes, literally is another one. We may say we were literally blown away, but that's not likely to be true except in a tornado or on a battlefield. Okay, no one is going to say "I was figuratively blown away," but I would be literally delighted to hear it.
Language evolves, in part with careless usage by local TV news announcers. Words mean what people want them to mean, and then one day the dictionary accommodates the changing usage.