Learn Spanish (Latin America): El piso está reduro y me duele la espalda. - The floor is super hard and my back hurts.

Reduro is a colloquial way of saying "super hard" or "really hard." It's formed by attaching the intensive prefix re- directly to the adjective duro (hard). In much of Latin America, adding re- is a very common, everyday alternative to using muy (very) or the -ísimo ending.

Is the prefix always attached to the word like that, without a space?

Yes! When you use re- or súper- as prefixes to make an adjective or adverb stronger, they are attached directly to the word with no space or hyphen. It is written as reduro, not re duro or re-duro.

Why does this sentence use "está" instead of "es"? Isn't a floor permanently hard?

You would use es to state an objective fact about the floor's material (e.g., concrete is hard). However, using está here emphasizes the speaker's physical, sensory experience in the moment. It translates more closely to "The floor feels super hard right now."

Why does it say "la espalda" (the back) instead of "mi espalda" (my back)?