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B1 adjective 10 min read

熟成した

Examples 熟成した in 30 Seconds
Explanation 熟成した in your Level:
At the A1 level, you don't need to worry about the complex kanji for 熟成した (jukusei shita). Instead, think of it as a special way to say 'good old' for things like cheese or wine. At this level, you usually learn basic adjectives like 'old' (furui) or 'new' (atarashii). However, if you go to a Japanese restaurant, you might see this word on the menu. Just remember that it means the food was kept for a long time to make it taste better. It is like 'matured.' You can use it simply: 'Kono chiizu wa jukusei shita' (This cheese is matured). It's a 'level up' word from just saying 'oishii' (delicious). Even at A1, knowing that some foods are 'special' because they are 'aged' helps you understand Japanese food culture better. Don't worry about the grammar too much yet; just treat it as a single adjective that describes high-quality, aged food.
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At the A2 level, you are starting to describe things in more detail. You can use 熟成した to talk about your favorite foods or drinks. For example, 'I like aged steak' would be 'Jukusei-niku ga suki desu.' You should start to notice the difference between 熟成した (aged) and 完熟した (ripe). If you are talking about a banana, use 'kanjuku.' If you are talking about cheese, use 'jukusei.' At this level, you are also learning the 'ta-form' of verbs. Since 'jukusei shita' is the ta-form of 'jukusei suru,' you can see how verbs become adjectives in Japanese. It's a great example of how the past tense describes a current state (a state of having matured). Try using it when you go shopping at a Japanese supermarket to find the 'aged' balsamic vinegar or miso. It will make your Japanese sound more specific and less like a beginner who only uses 'oishii.'
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At the B1 level, you should be comfortable using 熟成した in both culinary and metaphorical contexts. This is the level where you move beyond simple descriptions. You can use it to talk about ideas or plans: 'The plan has matured' (Keikaku ga jukusei shita). You should also understand the causative form 熟成させる (to make something mature). For example, 'I am aging this wine' (Kono wain o jukusei sasete iru). You are expected to know that 熟成 implies a positive improvement over time. It is not just 'getting old'; it is 'getting better.' You should also be able to distinguish it from 成熟 (seijuku), which is used for people or society. If you describe a person as 'jukusei shita,' it sounds like you are going to eat them! So, at B1, focus on using 熟成 for food, beverages, and abstract concepts like 'ideas' or 'debates,' while using 'seijuku' for human development.
At the B2 level, you should understand the nuance of 熟成した in professional and cultural discussions. You might encounter this word in a business meeting regarding 'matured markets' (熟成した市場) or 'matured technologies' (熟成した技術). At this level, you should be able to explain *why* something is 'jukusei shita' using more complex grammar. For instance, you could discuss the enzymatic process in beef or the iterative process of refining a product design. You should also recognize the word in literature or high-end journalism, where it might describe the 'matured atmosphere' of an old city or the 'matured wisdom' found in a classic book. Your usage should be precise, and you should be able to use the word to add a layer of sophistication to your speech. You should also be familiar with related terms like 熟成期間 (maturation period) and how they are used in industry-specific contexts.
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At the C1 level, you should have a deep appreciation for the aesthetic and philosophical connotations of 熟成した. You can use it to discuss the 'maturation of democracy' or the 'matured aesthetic' of a particular historical period (like the late Edo period). You should be able to use it interchangeably with more literary terms like 円熟 (enjuku) when appropriate, but knowing the subtle difference: 熟成 is more about the process and internal quality, while 円熟 is about the outward manifestation of that quality in skill or character. You should be able to engage in nuanced debates about whether a society's 'maturation' leads to stability or stagnation. In writing, you can use the word to create vivid descriptions of flavors or atmospheres, using it as a tool for 'show, don't tell'—implying depth, history, and careful cultivation without using those words directly. You should also be aware of technical variations in fields like chemistry or food science where 熟成 has specific definitions.
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At the C2 level, your mastery of 熟成した should be indistinguishable from that of a highly educated native speaker. You can use the word in complex metaphors, perhaps comparing the 'maturation' of a legal system to the aging of a fine wine, discussing how the 'sediment' of old precedents eventually leads to a clear and robust 'flavor' of justice. You should understand the word's place in the history of Japanese culinary terminology and how the 'jukusei' boom of the last decade has changed marketing and consumer expectations. You can use it in academic contexts to describe the 'maturation' of scientific theories or the 'tempering' of social movements. Your ability to use the word should extend to its most subtle registers, including ironic or poetic usages. You can navigate the fine line between 熟成 (positive maturation) and 劣化 (reka - deterioration), discussing the tipping point where the passage of time stops being a benefit and starts being a detriment, all while using the most sophisticated Japanese grammar and vocabulary.
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Examples

熟成した in 30 Seconds

  • Primarily describes food like meat, wine, and cheese that has been aged to improve flavor and texture through enzymatic processes.
  • Can be used metaphorically for plans, ideas, or skills that have reached a state of refinement and completion over a long period.
  • Differs from 'kanjuku' (ripe fruit) and 'seijuku' (human/social maturity), focusing instead on the quality improvement of substances or concepts.
  • Often found in marketing for high-end products, implying artisanal quality, patience, and a deep, umami-rich experience for the consumer.

The Japanese word 熟成した (jukusei shita) is a sophisticated adjective derived from the verb 熟成する (jukusei suru), which translates to 'aged' or 'matured.' At its core, the word describes a process where time is allowed to pass under controlled conditions to improve the quality, flavor, or depth of a substance. While it is most frequently encountered in the culinary world—particularly concerning meat, wine, cheese, and miso—it also carries metaphorical weight in Japanese culture, referring to the 'ripening' of plans, the 'maturation' of skills, or the 'tempering' of a person's character through experience.

Culinary Context
In Japanese gastronomy, 'jukusei' refers specifically to the enzymatic breakdown of proteins and fats that results in increased umami. For example, 熟成肉 (jukusei-niku) or 'aged meat' is a premium product where beef is kept in a temperature-controlled environment for weeks to enhance its tenderness and concentrate its flavor. This is distinct from simply being 'old'; it implies a purposeful, beneficial transformation.

このワインは地下の貯蔵庫で十年間熟成した最高級品です。
(This wine is a top-tier product that has matured in an underground cellar for ten years.)

Beyond the kitchen, the word appears in business and creative contexts. When a project or a strategic plan is described as 熟成した, it suggests that the idea has been carefully considered over time, allowing all potential flaws to be smoothed out and the strategy to become robust. It is the opposite of 'half-baked' (生煮え - namanie). In Japanese social dynamics, a 'matured' relationship is one that has moved past the initial excitement and has developed a deep, stable foundation of trust.

Abstract Usage
When describing a person's skill or a society's culture, 熟成した implies a state of refined perfection. A 'matured skill' (熟成した技術) is one that has reached a level of effortless mastery. In sociology, a 'matured society' (熟成した社会) refers to a nation that has moved past rapid economic growth and has focused on internal stability and cultural depth.

彼の演技は、長い年月を経て熟成した深みを感じさせる。
(His acting gives a sense of depth that has matured over many years.)

The kanji themselves tell the story: 熟 (juku) means 'ripen' or 'mature,' and 成 (sei) means 'to become' or 'to complete.' Together, they signify the completion of a ripening process. In modern Japan, you will see this word on labels in supermarkets (especially for 'aged' balsamic vinegar, soy sauce, or black garlic) and in high-end restaurant menus. It carries a connotation of luxury, patience, and artisanal quality. Using this word correctly signals that you understand the value of time in Japanese culture.

Temporal Nuance
The word implies that the passage of time is not passive. It is an active improvement. A car doesn't 'jukusei'; it just gets old. But a vintage violin or a batch of miso 'jukusei' because their quality improves as the components interact over time.

Using 熟成した correctly requires understanding its grammatical flexibility as both a verbal phrase and an attributive adjective. In Japanese, the past tense form of a verb often functions as an adjective to describe a completed state. When you say 'jukusei shita,' you are literally saying 'which has matured,' which translates naturally to the English adjective 'matured' or 'aged.'

Attributive Use (Before a Noun)
This is the most common way to use the word. You place it directly before the noun it describes. For example, 熟成したチーズ (jukusei shita chiizu - matured cheese). This structure is used to identify the quality of the object immediately.

スーパーで熟成した黒にんにくを買いました。
(I bought aged black garlic at the supermarket.)

When using it in the predicate (at the end of a sentence), you can use the form 熟成している (jukusei shite iru) to describe a current state of being matured, or 熟成した (jukusei shita) to emphasize that the process is finished. For instance, 'This meat is aged' could be 'この肉は熟成している' (focusing on the state) or 'この肉はしっかり熟成した' (focusing on the fact that it underwent the process).

Abstract and Professional Usage
In professional settings, particularly in craft or design, you might use it to describe a design language or a brand identity. 熟成したデザイン (a matured design) implies that the aesthetic has reached a point of balance and sophistication through iterative refinement.

このプロジェクトは、時間をかけて熟成したアイデアに基づいています。
(This project is based on an idea that has matured over time.)

Furthermore, in the context of human relationships or society, 'jukusei shita' is often paired with words like 議論 (giron - discussion) or 関係 (kankei - relationship). A 熟成した議論 is a discussion that has been thoroughly hashed out, where all viewpoints have been considered and the conclusion is 'ripe' for implementation. This highlights the Japanese cultural value of 'nemawashi' (laying the groundwork) and allowing consensus to mature naturally rather than forcing a quick decision.

Transitive vs. Intransitive
Note that 熟成する is intransitive (it matures). If you want to say you aged something intentionally, you use the causative form: 熟成させる (jukusei saseru). Thus, 熟成した肉 is 'meat that matured,' while 熟成させた肉 is 'meat that was made to mature.'

酒蔵で三年間熟成した日本酒は、香りが非常に豊かです。
(Sake that has matured for three years in a brewery has an extremely rich aroma.)

If you visit Japan, you will encounter 熟成した in specific high-value environments. The word is heavily utilized in marketing to signal quality and craftsmanship. One of the most common places is the **Department Store Basement (Depachika)**. In the meat or liquor sections, labels will proudly display 熟成 (jukusei) to justify a higher price point. You might see 熟成肉 (aged beef) or 熟成古酒 (matured vintage sake) featured in elegant displays.

Gourmet Television and Magazines
Japanese food programs often feature artisans who spend years perfecting their craft. A narrator might say, '熟成した旨味が口いっぱいに広がります' (The matured umami spreads throughout the mouth). This is a standard phrase in food reviews to describe the deep, savory flavor that comes from aging.

テレビのグルメ番組で、熟成したチーズの特集を見ました。
(I saw a special feature on matured cheese on a gourmet TV show.)

In the world of **Japanese Whiskey**, maturation is everything. Brands like Yamazaki or Hibiki are defined by how long they have 熟成した in barrels. You will hear this word in documentaries about distilleries or in the descriptions provided by bartenders at high-end 'Bar' establishments in Ginza or Shinjuku. They might discuss how the wood of the barrel has allowed the spirit to become 熟成した and smooth.

Traditional Craftsmanship
In the production of traditional Japanese products like Urushi (lacquerware) or certain types of paper, the raw materials are sometimes left to 'age' or 'mature.' A craftsman might explain that the material is only ready to be used once it has 熟成した, ensuring the longevity and beauty of the final piece.

この漆器の美しさは、素材が十分に熟成したからこそ生まれます。
(The beauty of this lacquerware is born precisely because the materials have sufficiently matured.)

Finally, you will hear it in **Political and Economic Discourse**. When analysts talk about Japan's 'matured economy' (熟成した経済), they are discussing a state where rapid growth is no longer the goal, but rather the maintenance of high standards of living and social systems. This usage conveys a sense of stability, though sometimes with a hint of concern about stagnation. Listening for this word in news broadcasts will help you understand the nuance of how Japanese society views its own development stage.

The most frequent mistake learners make with 熟成した is confusing it with other words for 'ripening' or 'growth.' In English, we might use 'mature' for a person, a fruit, and a steak, but Japanese is much more specific. Understanding these distinctions is crucial for sounding natural.

Mistake 1: Jukusei vs. Kanjuku (熟成 vs 完熟)
Learners often use 熟成した for fruit. However, for fruit that is perfectly ripe and ready to eat, the correct word is 完熟した (kanjuku shita). 熟成 is for processes involving chemical breakdown over long periods (like meat or wine), while 完熟 is for biological ripening on the vine or tree.

❌ このリンゴは熟成した。
✅ このリンゴは完熟した。
(This apple is perfectly ripe.)

Another common error is confusing 熟成 (jukusei) with 成長 (seichou). 成長 refers to the physical growth of a living thing (a child growing taller, a company getting bigger). You would never say a child has 'jukusei shita' unless you were making a very dark joke about them being like a piece of meat. For a person becoming mentally mature or wise, use 成熟 (seijuku) or 円熟 (enjuku).

Mistake 2: Jukusei vs. Hakkou (熟成 vs 発酵)
While they often happen together (like in miso or wine), they are not synonyms. 発酵 (hakkou) is 'fermentation' (microbial action). 熟成 (jukusei) is 'aging' (the wider process of flavor development). If you are talking about the bubbles in yogurt, that's hakkou. If you are talking about the deep flavor of 10-year-old miso, that's jukusei.

このヨーグルトは熟成した味がする。
(This yogurt tastes 'matured'—this is okay if you mean the flavor is deep, but if you mean it's fermented, 'hakkou' is better.)

Finally, watch out for the transitive/intransitive trap mentioned earlier. If you say 'I matured the meat,' you cannot say '私は肉を熟成した' (Watashi wa niku o jukusei shita). You must say '私は肉を熟成させた' (jukusei saseta). Using the intransitive form with an object is a common grammatical slip for English speakers who are used to 'mature' being used both ways.

To truly master Japanese, you need to know which 'mature' to use in which situation. While 熟成した is great for food and ideas, here are the alternatives you'll need for other contexts.

Mature (Human/Social): 成熟した (Seijuku shita)
This is the standard word for biological or psychological maturity. Use this for a 'mature student,' a 'mature body,' or a 'mature society.' It implies reaching a state of full development.
Mellow/Masterful: 円熟した (Enjuku shita)
This is a beautiful word used for artists, performers, or elderly people who have become 'mellow' and 'well-rounded' (literally, the kanji 円 means circle). It suggests a high level of skill combined with a calm, seasoned personality.

彼は円熟した演技を見せた。
(He showed a masterful/mellowed performance.)

When talking about fruit or vegetables, as mentioned, use **完熟 (Kanjuku)**. If something is 'old' in a positive way, like a vintage car or antique furniture, you might use **ヴィンテージ (Vintage)** or **年代物 (Nendaimono)**. If a plan is 'well-prepared,' you could use **練られた (Nerareta)**, which literally means 'kneaded' like dough, implying it has been worked on extensively.

Old/Stale: 鄙びた (Hinabita) or 古びた (Furubita)
If the aging is not positive, do not use 熟成. 熟成 always implies an improvement. If something is just old and decaying, use 古びた (furubita). If a place is 'quaint' or 'rustic' (old in a charming but worn way), use 鄙びた (hinabita).

このチーズはただ古いだけでなく、見事に熟成している。
(This cheese isn't just old; it is beautifully matured.)

In summary, choose your 'mature' based on the object. If you can eat it (and it's not a fruit), or if it's a 'ripe' idea, 熟成した is your best bet. If it's a person or a society, look toward 成熟 or 円熟. This precision will make your Japanese sound elegant and knowledgeable.

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Examples by Level

1

熟成したチーズはおいしいです。

Matured cheese is delicious.

Jukusei shita (adjective) + noun.

2

これは熟成したワインですか？

Is this a matured wine?

Question form using 'desu ka'.

3

熟成した肉を食べました。

I ate aged meat.

Past tense verb 'tabemashita'.

4

熟成した味噌は色が深いです。

Matured miso has a deep color.

Describing a physical trait (color).

5

このお酒は熟成した味がします。

This sake has a matured taste.

~no aji ga shimasu (tastes like...).

6

熟成したハムを買いました。

I bought matured ham.

Direct object with 'o'.

7

熟成したバルサミコ酢は高いです。

Aged balsamic vinegar is expensive.

Takai (expensive) as the predicate.

8

父は熟成したお酒が好きです。

My father likes matured liquor.

~ga suki desu (likes...).

1

熟成した肉は、普通の肉より柔らかいです。

Aged meat is softer than regular meat.

Comparison using ~yori.

2

冷蔵庫で熟成したキムチは酸っぱいです。

Kimchi aged in the fridge is sour.

Location particle 'de'.

3

このカフェでは熟成した豆のコーヒーが飲めます。

You can drink coffee made from aged beans at this cafe.

Potential form 'nomemasu'.

4

熟成した黒にんにくは甘くておいしいです。

Aged black garlic is sweet and delicious.

Te-form of adjective 'amaku-te' to connect ideas.

5

彼は熟成したワインをプレゼントしてくれました。

He gave me matured wine as a gift.

Giving/receiving verb 'kuremashita'.

6

熟成した味噌を使って、味噌汁を作りました。

I made miso soup using matured miso.

Using 'tsukatte' (using) to describe the process.

7

このチーズは三年以上熟成したものです。

This cheese is something that has matured for over three years.

~ijou (more than) + jikan (time).

8

熟成した香りが部屋に広がりました。

A matured aroma spread through the room.

Subject marker 'ga' with intransitive verb 'hirogatta'.

1

時間をかけて熟成したアイデアは、説得力があります。

An idea that has matured over time is persuasive.

Metaphorical use for 'ideas'.

2

この日本酒は、雪の中でじっくり熟成したものです。

This sake was matured slowly inside the snow.

Adverb 'jikkuri' (slowly/carefully).

3

熟成した技術を持つ職人は、尊敬されます。

Craftsmen with matured skills are respected.

Passive form 'sonkei saremasu'.

4

議論が十分に熟成したところで、採決を行いましょう。

Now that the discussion has sufficiently matured, let's take a vote.

~tokoro de (at the point when...).

5

熟成した友情は、簡単に壊れることはありません。

A matured friendship does not break easily.

Noun modification for abstract concepts.

6

このウイスキーはオーク樽で十二年間熟成したものです。

This whiskey is one that matured for twelve years in oak barrels.

Specific duration and location.

7

熟成した果実のような香りがするワインです。

It is a wine with an aroma like matured fruit.

~no you na (like a...) comparison.

8

計画が熟成した段階で、上司に報告しました。

At the stage where the plan had matured, I reported to my boss.

Noun 'dankai' (stage).

1

このプロジェクトは、数年間の研究を経て熟成した成果です。

This project is the result of maturation through several years of research.

~o hete (through/passing through).

2

熟成した市場では、新規参入が難しくなります。

In a matured market, new entry becomes difficult.

Economic context.

3

彼の演奏には、長年の経験に裏打ちされた熟成した深みがある。

His performance has a matured depth backed by years of experience.

~ni urauchisareta (backed by).

4

熟成した社会においては、量よりも質が重視される。

In a matured society, quality is emphasized more than quantity.

Sociological context.

5

低温で長期間熟成した肉は、アミノ酸が豊富に含まれています。

Meat aged at low temperatures for a long time is rich in amino acids.

Passive potential 'fukumarete imasu'.

6

熟成した議論を経て、ようやく新しい憲法案がまとまった。

Through matured discussion, a new draft of the constitution was finally compiled.

Formal political context.

7

このブランドのデザインは、時代と共に熟成した美しさを持っている。

This brand's design has a beauty that has matured along with the times.

~to tomo ni (along with).

8

熟成した人間関係を築くには、お互いの信頼が欠かせない。

To build a matured relationship, mutual trust is indispensable.

~ni wa (in order to...).

1

熟成した民主主義を維持するためには、市民の対話が不可欠だ。

Citizen dialogue is essential to maintain a matured democracy.

Political philosophy context.

2

その作家の文体は、晩年になってようやく熟成した域に達した。

The author's style finally reached a matured level in their later years.

~no iki ni tassuru (reach the level of).

3

熟成した組織は、変化に対して保守的になりがちである。

Matured organizations tend to become conservative toward change.

~gachi (tend to).

4

この建築物は、周囲の風景と溶け合い、熟成した趣を醸し出している。

This building blends with the surrounding landscape, exuding a matured atmosphere.

Literary expression 'omomuki o kamoshidashite iru'.

5

熟成した思考の末に導き出された結論は、揺るぎないものだった。

The conclusion reached after matured thought was unwavering.

~no sue ni (after a long process of...).

6

伝統芸能が熟成した形を保つためには、後継者の育成が鍵となる。

Training successors is key to maintaining the matured form of traditional arts.

Cultural preservation context.

7

熟成した文化の背景には、数世紀にわたる歴史の積み重ねがある。

Behind a matured culture lies the accumulation of centuries of history.

~ni wataru (extending over).

8

そのワインは熟成したことで、若かった頃の角が取れ、円やかになった。

By maturing, the wine lost its youthful edges and became mellow.

Metaphorical 'kado ga toreru' (edges are removed).

1

熟成した資本主義のパラドックスは、成長の鈍化と格差の固定化にある。

The paradox of matured capitalism lies in slowing growth and the solidification of inequality.

Advanced economic theory.

2

言葉が熟成した詩人の筆致は、一言一句に重みと余韻を湛えている。

The brushwork of a poet whose language has matured imbues every word with weight and resonance.

Highly literary 'tataete iru' (to be filled with).

3

熟成した知性は、安易な二項対立を排し、複雑な真実を直視する強さを持つ。

A matured intellect rejects easy binary oppositions and has the strength to face complex truths.

Abstract philosophical discourse.

4

この都市の路地裏には、長い時間が熟成した独特の生活臭が漂っている。

The back alleys of this city are filled with a unique 'smell of life' matured over a long time.

Evocative sensory description.

5

熟成した美意識は、華美な装飾を削ぎ落とした究極の簡素さに見出される。

A matured aesthetic sense is found in the ultimate simplicity after stripping away gaudy decorations.

Wabi-sabi aesthetic context.

6

熟成した議論の果てに到達した合意は、もはや個人の意見を超越していた。

The consensus reached at the end of matured debate had already transcended individual opinions.

Transcendent social context.

7

熟成したワインの澱のように、歴史の深淵には語られない真実が沈殿している。

Like the sediment of matured wine, unspoken truths settle in the depths of history.

Complex metaphor using 'chinden' (sedimentation).

8

熟成した技術がデジタル化の波に呑まれ、消えゆくのは文明の損失である。

It is a loss to civilization when matured techniques are swallowed by the wave of digitalization and disappear.

Cultural criticism context.

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