Introduction to Japanese Adjectives

Describing Things in Japanese

In English, adjectives are simple. "Big," "small," "hot," and "cold" don't change, regardless of whether you're talking about the past, present, or future. The verb does the heavy lifting: "The apple is red" vs. "The apple was red."

Japanese handles this differently. Adjectives themselves conjugate to show tense (past/present) and polarity (positive/negative). To describe the world around you accurately, you'll need to learn the two main categories of adjectives: I-Adjectives and Na-Adjectives.

い-Adjectives (I-Adjectives)

I-Adjectives (い形容詞) are adjectives that end with the hiragana character . They are a self-contained part of speech and can conjugate on their own.

Some common い-adjectives include:

Using I-Adjectives

There are two primary ways to use an i-adjective:

1. Directly Before a Noun: Just like in English, you place the adjective right before the noun it describes.

2. At the End of a Sentence: An i-adjective can end a sentence. For politeness, you typically add .

Conjugating I-Adjectives

This is where i-adjectives differ most from English. The ending changes based on tense and whether the statement is positive or negative.

Let's use as our example.

The rules are:

• Negative: Drop the final , add .
• Past: Drop the final , add .
• Past Negative: Start with the negative form (), drop its final , and add .

The Irregular Adjective: いい (Good)

The adjective is a common exception. It comes from the word , and all its conjugations use the よい form as the base.

• Present:
• Negative:
• Past:
• Past Negative:

な-Adjectives (Na-Adjectives)

Na-adjectives (な形容詞) are the second type. They are called "na-adjectives" because they require the particle when they are used to modify a noun. Many of these words can also function as nouns.

Some common な-adjectives include:

Using Na-Adjectives

1. Directly Before a Noun: You must place between the adjective and the noun.

2. At the End of a Sentence: When a na-adjective ends a sentence, you drop the and add (plain form) or (polite form).

Conjugating Na-Adjectives

Na-adjectives are simpler to conjugate because they behave just like nouns. The adjective itself doesn't change; you conjugate the copula (/) that follows it.

Let's use as our example.

Linking Multiple Adjectives

What if you want to say something is "cheap and delicious" or "quiet and beautiful"? You can't just list them. You need to use the te-form to connect them.

• For い-adjectives, drop the final and add .

• For な-adjectives, add after the adjective.

This is a powerful tool for building more complex sentences. For a deeper dive into this pattern, check out our guide on the Connect ideas with the て-Form.

Study Tips

• Recognize the Pattern: The most important first step is simply being able to identify whether an adjective is an i-adjective or a na-adjective. If it ends in い (and isn't an exception like きれい), it's probably an i-adjective.
• Na-Adjectives are like Nouns: If you remember that na-adjectives conjugate just like nouns (e.g., follows the same pattern as ), you've already mastered half the system.
• Listen and Read: The conjugation rules can seem abstract in a table. The best way to make them second nature is through exposure. As you listen to and read Japanese, pay attention to how adjectives change in different contexts. Over time, you'll develop an intuitive feel for what sounds right. Try finding some comprehensible input with A Practical Guide to Language Immersion.

Mastering adjectives will dramatically increase your expressive power in Japanese, allowing you to move from stating facts to describing the world in rich detail.