"Absolute" adjectives and adverbs are ones that shouldn't be compared (by using words like more, less, best, worst, and so on) because of their meanings. One of the most frequently misused comparative adjectives is
unique, meaning
one of a kind. Something cannot be
more unique or
most unique. Something is either one of a kind or it isn't. Adjectives like this (and their adverbial forms) are absolute; in fact, the word
absolute is an absolute adjective. Other words to watch out for are
essential, meaning
absolutely necessary; universal, meaning
present everywhere; and
immortal, meaning
living forever. With these adjectives and adverbs, comparative degrees are meaningless.