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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.

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?

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.
- rojo
→
rojos - alta
→
altas - inteligente
→
inteligentes
Example: Los coches rojos. (The red cars.)

Rule 2: Ends in a Consonant? Add -ES.
If the adjective ends in a consonant, make it plural by adding -es.
- fácil
→
fáciles - español
→
españoles
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) | |
---|---|---|
Masculine | El perro pequeño | Los perros pequeños |
Feminine | La gata pequeña | Las 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:
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.
Drag the handle to compare
You've Got This!
Let's do a quick recap of the golden rules:
- Find the Noun: Identify its gender and number.
- Choose the Adjective: Pick the adjective that best describes it.
- Make it Match: Change the adjective's ending to agree with the noun's gender (-o/-a) and number (-s/-es).
- 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!