In Spanish, there are a number of adverbs as well as a single suffix that can be used to intensify the meaning of other words.

Note: Intensifiers are not the same thing as comparatives, superlatives, or augmentatives (see below).

Intensifiers can be used with adjectives, adverbs, nouns, and verbs. They include words like muy (very), mucho (much, a lot), and sumamente (extremely).

Es muy bonita.   She is very pretty.
Tenemos mucho dinero.   We have a lot of money.

The suffix –ísimo is an intensifier that can be attached to the end of many adjectives. It agrees with the adjectives in gender and number:

-ísimo   -ísimos
-ísima   -ísimas

If the adjective that –ísimo attaches to ends in a vowel, the vowel is dropped. There may also be spelling changes due to hard/soft vowels.

La tarea es facilísima.   The homework is really easy.
Ana es bellísima.   Ana is absolutely beautiful.
Son riquísimos.   They are super rich.

Intensifiers vs Augumentatives and Diminutives

Whereas augmentatives and diminutives add a particular meaning to the word they modify (such as greatness or ridicule), intensifiers only intensify the meaning of the modified adjective itself.

Intensifiers vs Comparatives

Comparatives compare one person or thing to another. Intensifiers do not. The adjective modified by an intensifier is very (whatever) all by itself.

Intensifiers vs Superlatives

The superlative is the most/least something of a group. This is sometimes called the "relative superlative," while intensifiers, particularly the suffix –ísimo, are sometimes called the "absolute superlative." However, this is a misnomer, because intensifiers are not comparing anything.

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