Spanish Words with Suffix “-ÍSIMO” – Rules and Practice

Attaching “-ísimo” (or in some cases, a different suffix) at the end of an adjective is a way of expressing that adjective at an extreme degree. For example, look at this transformation:

  • grande = big
  • grandísimo = very very big, extremely big

In this lesson, we will explain how to form this adjectives, following these points:

1. “-ísimo” adjectives

For most adjectives, you can form their superlative using this formula:

  • If the Singular Masculine form of the adjective ends in a consonant, just attach “-ísimo” at the end. Pay attention to possible consonant transformations, such as the final “z” becoming “c”.


  • If the Singular Masculine form of the adjective ends in a vowel, first eliminate that vowel, and then add “-ísimo”. Again, pay attention to possible consonant transformations.


2. “-císimo” adjectives

Adjectives whose Singular Masculine form ends in “-n” or “-or”, usually form their superlative by adding “-císimo”:


3. “-bilísimo” adjectives

Adjectives ending in “ble” form their superlative by changing that final “-ble” for “-bilísimo”.


4. “-érrimo” adjectives

Some adjectives whose Singular Masculine form’s last syllable contains the letter “r”, add the ending “érrimo” in the following manner:


5. Feminine and Plural forms of Superlatives

As we have seen, we always take the singular masculine form of the adjective as our starting point to form the superlative.

That said, once we have formed the superlative, we can now match the superlative in gender and number to the noun it is connected to.

For example, the superlative for “grande” is “grandísimo”. Now we can match its gender and number to a certain noun, resulting in these 4 posibilites:

  • grandísimo
  • grandísima
  • grandísimos
  • grandísimas

6. Example Sentences

El coche es carísimo. = The car is extremely expensive. (caro = expensive)

Mi perra es grandísima. = My female dog is extremely big. (grande = big)

Los estudiantes son amabilísimos. = The students are extremely nice. (amable = nice)

Las chicas son celebérrimas. = The girls are extremely famous (célebre = famous)

7. Practice: A Quiz

Take this short Quiz to test your knowledge!:

8. Practice: An Exercise

This kid likes telling his friends how good his things are: his bike, his mom… Fill the gaps in your mind or on a piece of paper using Superlatives with “-ísimo”. Then check the solutions at the end of this post.

A picture of a child to illustrate the Exercise about words with "ísimo"

¿Os he dicho que tengo una bicicleta _____ 1. (buena)? Es azul y muy bonita.  Con ella puedo venir al colegio _____ 2. (rápido).
Me la compraron mis padres, que son _____ 3. (ricos). Ellos tienen un coche _____ 4. (grande) y _____ 5. (caro).
Mirad, una foto de mi madre. Es _____ 6. (joven), ¿verdad?. Y también es _____ 7.(amable) con todo el mundo, sobre todo con mis amigos. Venid un día a mi casa y seguro que nos prepara unos dulces _____ 8.(sabrosos).

Solutions to the Exercise: 1 = buenísima, 2 = rapidísimo, 3 = riquísimos, 4 = grandísimo, 5 = carísimo, 6 = jovencísima, 7 = amabilísima, 8 = sabrosísimos

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