Superlatives

The superlative form can be formed in several different ways:

1. With the suffix -issimo. The suffix replaces the final vowel of an adverb or of the masculine plural form of adjectives and nouns. If attached to an invariable word (such as an adverb), the superlative suffix is invariable. Otherwise, it changes according to gender and number.

Basic Word [Transformation]

Superlative

English Equivalent

male --> mal-

malissimo

very bad

subito --> subit- 

subitissimo

very soon, right away

caldo --> caldi --> cald- 

caldissimo

hottest, very hot

grande --> grandi --> grand-

grandissimo

biggest, very big

stanco __> stanchi -- stanch-

stanchissimo

very tired

amico --> amici --> amic-

amicissimo

very good friend

2. Placing an adverb before the basic word. Adverbs of this type include: molto, completamente, totalmente, tanto, assai, immensamente, terribilmente.

Basic Word 

Superlative

English Equivalent

male 

molto male

very bad

presto 

assai presto

very soon

caldo 

terribilmente caldo

hottest, very hot

grande 

tanto grande

very big

3. With adjectives, using the definite article and placing "più"  before the adjective. 

Phrase

Superlative

English Equivalent

un film recente 

il film più recente

the most recent movie 

grossa spesa 

la più grossa spesa

the biggest expense

4. With a small number of adjectives, repeating the adjective twice. 

Phrase

Superlative

English Equivalent

una macchina nuova 

una macchina nuova nuova

a very new car 

una casa grande 

una casa grande grande

a very big house 

5. With a small number of adjectives, placing the adjective "tutto" before the main adjective. "Tutto" must agree in gender and number. 

Phrase

Superlative

English Equivalent

una macchina nuova 

una macchina tutta nuova

a completely new car 

la casa è pulita

la casa è tutta pulita

the house is totally clean 

6. With a small number of adjectives, using a special "superlative" form. 

Adjective

Superlative

English Equivalent

acre 

il mio acerrismo nemico

my worst enemy 

Here is a short list of such words:
acre > acerrimo
integro > integerrimo
celebre > celeberrimo
misero > miserrimo
salubre > saluberrimo
benefico > beneficentissimo
benevolo > benevolentissimo
maledico > maledicentissimo
munifico > munificentissimo

7. In a small number of idioms, by adding a modifier (noun, adjective, or phrase) to the adjective. 

Adjective

Superlative

English Equivalent

freddo 

freddo cane

dead cold 

ubriaco 

ubriaco fradicio

dead drunk

ricco 

ricco sfondato

filthy rich

pieno

pieno zeppo

full to the brim

stanco 

stanco morto

dead tired

bello da morire

bello da morire

incredibly beautiful

caro 

caro arrabbiato

awfully expensive

salato 

salato arrabbiato

awfully salty

scemo 

scemo completo

completely crazy

caldo

caldo bollente

boiling hot

8. In a small number of idioms using a noun, by adding "di", the definite article and the plural form fo the noun.

Adjective

Superlative

English Equivalent

il Re 

il Re dei Re

The King of Kings

il cantico 

il Cantico dei Cantici

the Song of Songs

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