Structure
おおきい, おいしい, はやい
Details
Part of Speech
Adjective
Word Type
Independent Word
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Standard
About い-Adjectives
In Japanese, い-Adjectives are known as 'form containing words', and are used to describe nouns. All い-Adjectives end in い in their base form.
As mentioned, all い-Adjectives end in い in their base form. However, not all words ending in い are い-Adjectives. Let's take a look at some of the words that are commonly mistaken for い-Adjectives.
In addition to きらい above, there is also きれい. きれい actually comes from the kanji structure 綺麗, with い being part of the kanji itself. This is never the case with い-Adjectives, where the い will always be outside of the kanji. Due to the kanji for 綺麗 being somewhat difficult, this word is often written in hiragana or katakana, which leads to confusion for learners. Unfortunately there is no rule for distinguishing which words ending in い are not い-Adjectives, but thankfully, there are not very many of them, so it won't be long before you become familiar with them.
Caution
Unlike な-Adjectives, い-Adjectives must never be followed by だ. This is due to だ only being able to conjugate with nouns (which な-Adjectives originally are). Instead, です is used with い-Adjectives to make them sound more polite.
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日本の道は、狭いです。 (Natural Japanese)Japan's roads are narrow.
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温泉の風呂は熱いだ。 (Unnatural Japanese)The onsen's baths are hot.
Fun Fact
Although using です with い-Adjectives is very common, it is actually incorrect Japanese. As です is simply a polite variation of だ, it follows all of the same conjugation rules as だ. This means that it should only be attached to nouns and な-Adjectives. However, as most Japanese natives do not know this rule, it is widely considered natural to use.
Synonyms
Examples
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暑いです。
It is hot.
今日は暑いです。
It is hot today.
寒いです。
It is cold.
これは楽しいです。
This is fun.
新しい車。
A new car.
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Online
List of N5 いAdjectives
NihongoIchiban
The origin of いadjectives
BriefJapanese
The i-adjective
Tae Kim
い and な Adjectives
Japanese Ammo
Offline
Genki I
Page 100
みんなの日本語 I
Page 56 [CH 8]
[DBJG] A Dictionary of Basic Japanese Grammar
Page 6
Genki I 2nd Edition
Page 132
Tae Kim's Japanese Grammar Guide
Page 40
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い-Adjectives – Grammar Discussion
Most Recent Replies (37 in total)
Motifier
It was provided before and they’ve said that theyll be fixing it asap, no idea what that time frame is though… - い-Adjective No longer show the word to right? - #2 by Asher
mietolim
Thank you for providing the info!
Guguru-san
I’m a little confused about the example phrase 新しい車。 Wouldn’t either -い or -た have to go at the end to make it a correct sentence? I’m thinking either 新しい車だ or 車は新しい。Any thoughts?
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