From Teflpedia

Really is an English adverb that acts as an intensifier.[1]

Though related to the adjective real (meaning...), in everyday speech it is an intensifier.

It can also be used as an interjection to express surprise.

Best not to use really with strong adjectives.

In formal registers, use of really is a stylistic weakness; it's better to use strong adjectives, or the adverb "extremely"; or to express realness, "actually", "truly", "doubtlessly", etc.

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