い形容詞（いけいようし、ikeいyoushi）
- i-adjective

The word い形容詞 (い形容詞) means "i-adjective" in English. い形容詞 are a type of adjective in the Japanese language. They are called "i-adjectives" because they always end with the sound い (i) when in their plain, dictionary form. They modify nouns and pronouns, describing their qualities, characteristics, or states. They can be conjugated to change their meaning, such as to express past tense, negativity, or politeness.

⚫︎ あの車は高いです。 Translation: That car is expensive. ⚫︎ このケーキは美味しいです。 Translation: This cake is delicious. ⚫︎ 今日は暑いです。 Translation: It's hot today.

い形容詞 are used to describe the qualities of nouns. You can place them before a noun directly (less common), or, more commonly, use them with the copula です (desu) at the end of a sentence to express politeness. To describe the state or condition of something. * To say something is "not" something, you conjugate them using the negative form (see conjugation in next section). * To say something "was" or "was not" something, use the past tense forms (again, see conjugation in next section). * They are versatile and essential for basic description.

い形容詞 are written primarily in: * Hiragana: いけいようし * Katakana: イ形容詞 (used primarily for loan words or emphasis) * Kanji: 形容詞 (This is a more general term for "adjective"; the "i" is understood) * Variations in 送り仮名 (okurigana, the suffix hiragana) are usually not applicable, as they typically use the basic form. * The "i" at the end of い形容詞 remains, and is used to conjugate the adjective. * For example, 美味しい (oishii, delicious) is a common い形容詞. Its root is 美味し (oishi), and the い (i) is what indicates it is an i-adjective.

There are no direct synonyms for the term い形容詞 itself, as it is a grammatical classification. However, if you are looking for synonyms of a specific い形容詞 word like 高い (takai, expensive), you can use words like: * 高価な (kōkana, expensive/costly) - Na-adjective * 値段が高い (nedan ga takai, the price is high) - a phrase * or other descriptive words which expresses similar meaning.

Again, there are no direct antonyms for the term い形容詞. You would look for antonyms of specific い形容詞. For example, the antonym of 高い (takai, expensive) would be 安い (yasui, cheap). Here are some example い形容詞and their antonyms: * 暑い (atsui, hot) ⇔ 寒い (samui, cold) * 大きい (ōkii, big) ⇔ 小さい (chiisai, small) * 美味しい (oishii, delicious) ⇔ 不味い (mazui, not tasty) - a negative form of an い形容詞 * 良い (yoi/ii, good) ⇔ 悪い (warui, bad) * 古い (furui, old) ⇔ 新しい (atarashii, new)

この本は面白いです。 ・Translation: This book is interesting. ・Explanation: The い形容詞 面白い (omoshiroi, interesting) describes the book. The です (desu) makes the statement polite.

そのレストランは安くなかったです。 ・Translation: That restaurant was not cheap. ・Explanation: 安くなかった (yasuku nakatta) is the past negative form of the い形容詞 安い (yasui, cheap). The sentence describes that the restaurant did not have a cheap price.

The term い形容詞 (い形容詞) is a compound word. 形容詞 (keiyōshi) means "adjective". The い (i) simply signifies the specific type of adjective that ends in い (i) in its dictionary form. Therefore, it is literally "i-adjective". The etymology refers to the grammatical function and the character which it uses.