Superlative adverbs carry the idea of an action or a quality to the highest degree. They do not name people or things; they mainly modify the verb and add intensity, quantity, or an extreme manner. In runs quickly, the adverb describes how he runs. In runs extremely quickly, the action is taken to the maximum. If you remove the adverb, the sentence remains correct, but it loses that nuance of intensity: speaks, works, sleeps. These adverbs are used to say that something happens in a very strong, very complete way or with the greatest possible degree, as in he is tremendously tired or it rained a lot.

Intensive uses of superlative adverbs

Usage	Explanation
Maximum intensity	They are used to say that an action occurs with the greatest possible intensity and they sound very emphatic.
Emotional emphasis	They serve to show a very strong reaction to what happens.
Extreme valuation	They are used when we want to highlight that something reaches a very high level.

The most common intensification is done with very and with muchísimo. Very goes in front of the adverb and raises its intensity: very fast, very well, very far. Muchísimo expresses a greater intensity and can also function as an independent adverb: runs very much, speaks very much. When you want to mark the utmost degree in an absolute way, you use the most + adverb: the most fast possible, the most near possible, the most gently possible. This structure appears a lot with limit or goal expressions, especially when comparing to an ideal maximum.

Common forms of adverbial intensification

Idea
Usa very para intensificar un adverbio o una cualidad de manera general.
Usa muchísimo para expresar una intensidad más fuerte que very.
Usa lo más para decir que algo es superlative en grado máximo.

Adverbs ending in -mente accept intensification in front of the complete form: very clearly, much more easily, as carefully as possible. The base remains the -mente form, and the intensifier does not change that form. In real speech, very is the most frequent option with these adverbs: answered very clearly, worked very slowly. Muchísimo appears when a stronger emphasis is desired: improved muchísimo faster. The sequence the most + adverb + possible is common when aiming for the utmost precision or best result: explains as clearly as possible.

Intensification of adverbs ending in -mente

Idea
With an adverb in mente, very can reinforce the way the action occurs.
With an adverb in mente, extremely adds an exaggerated intensity.
With an adverb in mente, the most creates a very expressive superlative effect.

These adverbs are usually placed close to the verb, because the idea they modify is in the action: speaks very slowly, arrived extremely late, moved as quietly as possible. When they intensify another adverb, the intensifier goes in front: very well, much, much closer. They do not change for gender or number. The same form works for a woman, a man or several subjects: speaks very clearly, they speak very clearly, arrived very early, they arrived very early. They also do not agree with the noun, because they do not describe nouns but actions, degrees or manners.

Position and form of superlative adverbs

Idea
These adverbs are usually placed next to the verb they modify.
These adverbs are invariable and do not change for gender or number.
When an intensive locution appears, it remains fixed as a unit.

Very and the most sound neutral and are usable in almost any context. Muchísimo adds more strength and appears both in everyday speech and in expressive writing: I like it a lot, he arrived extremely late. In conversation, emphatic forms with superlative value are also used, such as súper bien, bastante mal, requetebien, although not all belong to the same level of formality. In colloquial language, lo más can function without explicit comparison to express admiration or evaluation: it's the best, he looked the best of all. In formal texts, it is usually preferred to use very, extremely, or precise structures with the most + adverb + possible.

relo másbien

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En el habla informal funciona como intensificador muy frecuenteEn registro coloquial puede intensificar una cualidad o una acción con naturalidadSe usa mucho en el habla cotidiana para dar un tono expresivo y muy enfático

Nuances of use and common register

Region	Variant	Definition	Example
Spain	lo más	It is widely used in everyday speech to give an expressive and very emphatic tone.	Tu disfraz es lo más divertido de la fiesta.Your costume is the most fun thing at the party.
Mexico	bien	In colloquial register it can intensify a quality or an action naturally.	Ese perro corre bien rápido por el patio.That dog runs well fast across the yard.
Argentina	re	In informal speech it works as a very common intensifier.	La película estuvo re buena y el pochoclo desapareció solo.The movie was re good and the popcorn disappeared on its own.

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