What is the difference between "病気になる", "空く", "独立する", "げっそり", "痩せこける"?

"病気になる" means "to become sick; to get ill", "空く" means "to become empty, to become available, to be vacant (intransitive)", "独立する" means "to become independent; to stand alone", "げっそり" means "become thin, lose a lot of weight (from worry/illness); feel disappointed/discouraged", "痩せこける" means "to become very thin, to become emaciated, to be gaunt".

Quintuple VS

Synonym Boundary: "病気になる", "空く", "独立する", "げっそり", "痩せこける"

All represent the core concept "become", but require precise selection.

Japanese Option A

病気になる

びょうきになる (byōki ni naru)

N4 / CEFR

Japanese Option B

空く

あく (aku)

N3 / CEFR

Japanese Option C

独立する

どくりつする (dokuritsusuru)

N3 / CEFR

Japanese Option D

げっそり

げっそり (gessori)

N2 / CEFR

Japanese Option E

痩せこける

やせこける (yasekokeru)

N2 / CEFR

Quintuple VS Nuance Contrast & Social Differences

When expressing "become" in Japanese, you must carefully distinguish between "病気になる", "空く", "独立する", "げっそり", "痩せこける" based on context.

病気になる (びょうきになる (byōki ni naru) - Level: N4): Maps to "to become sick; to get ill" and is used when 「病気」は名詞で、「〜になる」は状態の変化を表す動詞です。健康な状態から病気の状態へ変わることを指します。.
空く (あく (aku) - Level: N3): Maps to "to become empty, to become available, to be vacant (intransitive)" and is used when Intransitive verb. Used for spaces becoming empty.
独立する (どくりつする (dokuritsusuru) - Level: N3): Maps to "to become independent; to stand alone" and is used when Used when a country gains sovereignty, an individual becomes self-reliant and lives apart from their family, or an organization/unit operates autonomously..
げっそり (げっそり (gessori) - Level: N2): Maps to "become thin, lose a lot of weight (from worry/illness); feel disappointed/discouraged" and is used when Describes a sudden and significant loss of weight due to illness, worry, or shock, resulting in an emaciated appearance. Can also describe a feeling of deep disappointment..
痩せこける (やせこける (yasekokeru) - Level: N2): Maps to "to become very thin, to become emaciated, to be gaunt" and is used when To become extremely thin, often to an unhealthy degree, due to illness, hardship, lack of food, or stress. It implies a noticeable and often skeletal appearance. 病気や苦労、食事不足などにより、極度に痩せて骨ばった状態になることを指す。健康的な痩せ方ではない、というニュアンスがある。.

Mixing these up can easily lead to unnatural translations. Refer to the bilingual context cards below to master the boundaries!

Context for "病気になる"

熱があって、病気になりました。

I had a fever and became sick.

Context for "空く"

席が空いたら、座ってください。

Please sit down when a seat becomes available.

Context for "独立する"

彼は大学を卒業後、実家から独立した。

After graduating from university, he became independent from his parents' home.

Context for "げっそり"

彼は病気でげっそり痩せてしまった。

He became terribly thin from illness.

Context for "痩せこける"

病気で彼はすっかり痩せこけてしまった。

He became completely emaciated due to his illness.

Synonym Mastery Challenge

Which Japanese word perfectly fits this blank space?

Fill in the blank: "熱があって、病気になりました。" (Meaning: "I had a fever and became sick.")

🎉 Correct Answer!

Remember: "病気になる" is correct here because it represents "to become sick; to get ill" in the context: "I had a fever and became sick.".