Spanish Adjective Agreement: The Ultimate Guide to Gender and Number

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Ever feel like you're just listing facts in Spanish? "The car is red. The house is big." Adjectives are the magic ingredients that turn boring statements into rich, detailed descriptions. They're the difference between a coloring book and a masterpiece!

In English, we have it easy. We can say "a tall man," "a tall woman," "tall boys," and "tall girls." The word "tall" never changes.

Spanish, however, asks you to be a bit more of a detective. The adjective has to change its form to "agree" with the noun it's describing. This is called adjective agreement, and it’s a cornerstone of sounding natural in Spanish.

Don't worry, it's not as complex as it sounds. We'll break it down into two simple concepts: Gender and Number.

The Golden Rule: Match the Noun!

If there's one thing you take away from this guide, let it be this:

In Spanish, descriptive adjectives must always match the gender (masculine or feminine) and number (singular or plural) of the noun they describe.

Think of it like a dance partnership. The noun leads, and the adjective follows, perfectly matching its every move.

A stylized, smiling blue book with the masculine symbol leading a smiling red adjective with the masculine symbol in a simple dance. Charming ink and watercolor painting, clean lines, vibrant but soft color palette, storybook style, dark background.

Let's break down the steps of this dance.

Part 1: Gender Agreement (Masculine & Feminine)

First, we need to figure out if our noun is masculine or feminine. As a quick refresher:

  • Nouns ending in -o are usually masculine (e.g., el libro - the book).
  • Nouns ending in -a are usually feminine (e.g., la casa - the house).

Once you know your noun's gender, you can choose the right adjective form.

Rule 1: The -O / -A Switch

This is the most common rule. If an adjective ends in -o in its default (masculine, singular) form, you simply change the -o to an -a to make it feminine.

  • Masculine: El chicoboy altotall. (The tall boy.)
  • Feminine: La chicagirl altatall. (The tall girl.)

See how alto changes to alta to match chica? Easy, right?

Side-by-side comparison. On the left, a blue book with the label "libro rojo". On the right, a red apple with the label "manzana roja". The 'o' and 'a' endings are highlighted. Charming ink and watercolor painting, clean lines, vibrant but soft color palette, storybook style, dark background.
Incorrecto ❌Correcto ✅

La chica alto.

La chica alta.

Drag the handle to compare

Rule 2: The "Neutral" Adjectives

What about adjectives that don't end in -o? Good news! Most adjectives that end in -e or a consonant don't change for gender. They have the same form for both masculine and feminine nouns.

  • Ending in -e:
    • El hombre inteligente. (The intelligent man.)
    • La mujer inteligente. (The intelligent woman.)
  • Ending in a consonant:
    • Un examen fácileasy. (An easy exam.)
    • Una lección fácil. (An easy lesson.)

Easy to Remember!

Think of adjectives ending in -e or most consonants as a little lazy. They don't want to do the extra work of changing for gender!

Rule 3: The Exceptions (Nationality & More)

Of course, there are a few exceptions. The most common ones are adjectives of nationality and adjectives ending in -or, -án, -ón, or -ín. These do change for gender. You just add an -a at the end for the feminine form.

  • Nationality:
    • El hombre español. (The Spanish man.)
    • La mujer española. (The Spanish woman.)
  • Ending in -or:
    • Un chico trabajadorhard-working. (A hard-working boy.)
    • Una chica trabajadora. (A hard-working girl.)

Test Your Knowledge!

Ready for a quick check-in? Let's see if you've got the gender rules down.

Which adjective correctly describes 'la casa' (the house)?

Part 2: Number Agreement (Singular & Plural)

You've mastered gender! Now for the second part of the puzzle: number. This is even more straightforward.

Rule 1: Ends in a Vowel? Add -S.

If your adjective (in its singular form) ends in a vowel (-a, -e, -i, -o, -u), you just add an -s to make it plural.

  • rojorojos
  • altaaltas
  • inteligenteinteligentes

Example: Los coches rojos. (The red cars.)

On the left, a single red flower labeled "flor roja". On the right, three red flowers labeled "flores rojas", with the 's' highlighted. Charming ink and watercolor painting, clean lines, vibrant but soft color palette, storybook style, dark background.

Rule 2: Ends in a Consonant? Add -ES.

If the adjective ends in a consonant, make it plural by adding -es.

  • fácilfáciles
  • españolespañoles

Example: Los examenes fáciles. (The easy exams.)

Rule 3: The Special -Z

Here's one little spelling trick to watch out for. If an adjective ends in -z, you change the z to a c before adding -es.

  • feliz(happy) →felices

You can learn more adjectives for feelings and states of mind to practice this rule.

Spelling Alert!

Don't forget the z → c switch before adding -es for plurals. It’s a common spelling rule in Spanish you'll see with nouns, too!

Putting It All Together: The Four Forms

So, most adjectives that change for gender and number will have four possible forms. Let's look at pequeño (small) and some common animals.

Singular (one)Plural (more than one)
MasculineEl perro pequeñoLos perros pequeños
FeminineLa gata pequeñaLas gatas pequeñas

You have to match BOTH gender and number. Las gatas pequeños would be incorrect because pequeños is masculine, but gatas is feminine.

Let's Practice!

Time to unscramble a sentence. This will test your knowledge of agreement and word order. Drag the words into the correct order.

Arrange the words to form a correct sentence:

son
Las
casas
blancas
muy

A Final Note on Placement

As you saw in the last exercise, there's one more key difference from English:

In Spanish, descriptive adjectives almost always go after the noun.

This can feel backward at first, but you'll get used to it quickly.

English Word Order 🇬🇧Spanish Word Order 🇪🇸

The blue car.

El coche azul.

Drag the handle to compare

You've Got This!

Let's do a quick recap of the golden rules:

  1. Find the Noun: Identify its gender and number.
  2. Choose the Adjective: Pick the adjective that best describes it.
  3. Make it Match: Change the adjective's ending to agree with the noun's gender (-o/-a) and number (-s/-es).
  4. Place it After: Put the adjective after the noun in your sentence.

Mastering adjective agreement is a huge step toward sounding fluent and natural in Spanish. It shows you're paying attention to the details. Keep practicing, and soon it will become second nature!

Practice Exercises

Question 1 of 10

El perro es ___ (negro).

Frequently Asked Questions

What is adjective agreement in Spanish?

It's the rule that descriptive adjectives must change their endings to match the gender (masculine/feminine) and number (singular/plural) of the noun they describe.

Do all Spanish adjectives change for gender?

No! Many adjectives that end in -e or a consonant are "neutral" and have the same form for both masculine and feminine nouns. However, adjectives of nationality or those ending in -or are common exceptions.

Where do adjectives go in a Spanish sentence?

Most descriptive adjectives come *after* the noun in Spanish, which is the opposite of English. For example, we say "the red car" in English, but "el coche rojo" in Spanish.

How do you make an adjective plural in Spanish?

If the adjective ends in a vowel, you add -s. If it ends in a consonant, you add -es. If it ends in -z, you change the z to a c and add -es (e.g., feliz -> felices).