Invariable Nouns
Invariable nouns (sostantivi invariabili) do not change their endings when they become plural. You identify their number through the article or accompanying adjectives.
How It Works
Invariable nouns are a common exception to the standard rules of plural formation. A noun is invariable if it meets one of these criteria:
- Accented final vowels: Words ending in a stressed vowel, like la città (the city), il caffè (the coffee), or la tribù (the tribe).
- Monosyllables: Very short words like il re (the king) or lo sci (the ski).
- Nouns ending in a consonant: This includes foreign loanwords like il film, il computer, or lo sport, as well as words like il gas or il bus.
- Clipped words: Shortened versions of longer words, like la foto (from fotografia) or la moto (from motocicletta). Note: The feminine noun la mano is a major exception; it is not clipped and changes to le mani.
- Nouns in -i: This includes feminine nouns like la crisi (the crisis) and masculine nouns like il brindisi (the toast) or l'alibi.
- Compound Nouns (Verb + Noun): These are invariable only if the noun part is already plural (il cavatappi) or feminine singular (il portacenere). If the noun part is masculine singular, the word is usually variable (e.g., il passaporto becomes i passaporti). A common exception is l'asciugamano, which becomes gli asciugamani.
- Masculine nouns in -a: A specific small group including il sosia (the double) or il gorilla. Note that most masculine nouns in -a, like il problema, are actually variable (i problemi).
- Nouns in -ie: Such as la serie or la specie. Note: la moglie (the wife) is a common exception that becomes le mogli, and la superficie usually becomes le superfici.
The currency euro is also invariable (un euro, due euro).
Examples (6)
- Il caffè è buono. / I caffè sono buoni.
The coffee is good. / The coffees are good.
Word by Word: The coffee is good. / The coffees are good.
Notice how 'caffè' does not change; only the article 'il/i', the verb 'è/sono', and the adjective 'buono/buoni' change.
- Ho fatto una foto. / Ho fatto molte foto.
I took a photo. / I took many photos.
Word by Word: I have made a photo. / I have made many photos.
'Foto' is a clipped word (from fotografia) and remains 'foto' in the plural.
- Guardo un film. / Guardo due film.
I am watching a movie. / I am watching two movies.
Word by Word: I watch a film. / I watch two film.
Foreign loanwords like 'film' do not take an 's' or change their ending in Italian.
- La città è antica. / Le città sono antiche.
The city is ancient. / The cities are ancient.
Word by Word: The city is ancient. / The cities are ancient.
Nouns ending in an accented vowel like 'à' are always invariable.
- Uso un cavatappi. / Abbiamo due cavatappi.
I use a corkscrew. / We have two corkscrews.
Word by Word: I use a corkscrew. / We have two corkscrew.
Compound nouns made of a verb (cava) and a noun (tappi) often stay the same in the plural.
- Costa solo un euro. / Costa dieci euro.
It costs only one euro. / It costs ten euros.
Word by Word: It costs only one euro. / It costs ten euro.
The word 'euro' is treated as an invariable noun in standard Italian.
Common Mistakes
Adding an 's' to foreign loanwords in the plural.
Ho comprato due computers.Ho comprato due computer.In Italian, foreign words used in their original form do not take a plural 's'. They remain invariable.
Changing the ending of accented words (hyper-correction).
Le universite sono grandi.Le università sono grandi.Learners often try to change 'à' to 'e' to match feminine plural rules, but accented endings never change.
Using the wrong gender for clipped words like 'foto'.
Il foto è bello.La foto è bella.Even though 'foto' ends in 'o', it is feminine because it comes from 'fotografia'. Its gender remains feminine in both singular and plural.
How It Connects
Learn This First
To understand invariable nouns, you first need to know how regular Italian nouns change from singular to plural. This pattern covers nouns that break those standard rules by remaining the same regardless of number.
Related Patterns
- Definite Articles
Since the noun doesn't change, the definite article is the primary way to tell if an invariable noun is singular or plural.
Level 1 - Adjective Agreement
Adjectives must still agree in number with invariable nouns, even if the noun itself doesn't change form.
Level 1 - -o / -aNoun Gender (-o/-a)
Understanding standard gender endings helps identify why clipped words like 'la foto' or 'il cinema' are exceptions.
Level 1 - -tàNoun Suffix -tà
Nouns ending in the suffix -tà (like università) are a major category of invariable nouns.
Level 3
Sources
Practice Invariable Nouns in Bubblegum
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