N5#adjectives#description#grammar#n5

い-Adjectives

Describe with い-adjectives — the foundation of Japanese description.

Context

Describing the World

When you want to talk about your surroundings, you need more than just nouns. You need words to describe how things look, feel, or taste. In Japanese, the most common way to do this is by using a special group of words called 'i-adjectives'.

Imagine you are at a cafe. You want to tell your friend that the coffee is hot or that the cake is delicious. Instead of just saying 'coffee' or 'cake', you use adjectives to add detail to your conversation.
Explanation

The い-Adjective Formula

Japanese adjectives are called 'i-adjectives' because they always end with the hiragana character い (i). They function as the predicate of a sentence, meaning they can end a sentence directly before 'です'.

NounAdjectiveです
To use an i-adjective, simply place your subject followed by the topic marker 'は', then the adjective, and finally 'です' to make the sentence polite. Unlike English, you do not need a verb like 'is' or 'are' because the adjective itself acts as the description.

Watch out

Do not add 'な' (na) between an i-adjective and the noun it modifies. Only 'na-adjectives' use 'な'. Remember: if it ends in 'い', it is an i-adjective!
Examples

Seeing it in Action

Here are some common ways to use i-adjectives to describe things around you.

コーヒー(こーひー)熱い(あつい)です

The coffee is hot.

コーヒーこーひーcoffeetopic marker熱いあついhotですですpolite copula

このケーキ(けーき)美味しい(おいしい)です

This cake is delicious.

このこのthisケーキけーきcaketopic marker美味しいおいしいdeliciousですですpolite copula

今日(きょう)忙しい(いそがしい)です

Today is busy.

今日きょうtodaytopic marker忙しいいそがしいbusyですですpolite copula

Which sentence correctly describes a cold room?

  • 部屋は寒いです。
  • 部屋は寒いですです。
  • 部屋寒いです。

The correct structure is [Noun] + は + [Adjective] + です. '寒いです' is the correct form.

Usage

Usage and Nuance

i-adjectives are very versatile. You can use them to describe a noun directly (e.g., 'a hot coffee') or as the predicate of a sentence (e.g., 'the coffee is hot').

Predicate vs. Attributive

コーヒーは熱いです

Predicate: The coffee is hot.

熱いコーヒー

Attributive: A hot coffee.

Note

In casual speech, you can drop the 'です' at the end of a sentence. However, in polite situations (like meeting someone for the first time), always keep 'です'.

Which version is more polite?

  • 美味しいです
  • 美味しい

Adding 'です' makes the sentence polite and suitable for most social situations.

Deep dive

Exceptions to the Rule

While most words ending in 'い' are i-adjectives, there are a few sneaky exceptions that are actually nouns or na-adjectives.

Some words like 'きれい' (beautiful/clean) end in 'い' but are actually na-adjectives. You can tell because they don't follow the same conjugation rules as true i-adjectives. As you learn more vocabulary, you will start to recognize these patterns naturally.
Summary

Lesson Recap

i-adjectives are the primary way to describe qualities in Japanese. They end in 'い' and can be used directly before 'です' to form a complete descriptive sentence.

熱い
あついi-adjective
hot (to the touch)
美味しい
おいしいi-adjective
delicious
忙しい
いそがしいi-adjective
busy
寒い
さむいi-adjective
cold (weather/temp)
新しい
あたらしいi-adjective
new

Practice this grammar interactively

Read the explanation above for free, then study it with quizzes, audio, and spaced repetition in the yomion app.

Open in the app