What is the difference between "病気になる", "空く", "独立する", "げっそり", "かじかむ"?

"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", "かじかむ" means "to become numb with cold; to be benumbed with cold (e.g. hands)".

Quintuple VS

Synonym Boundary: "病気になる", "空く", "独立する", "げっそり", "かじかむ"

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

かじかむ

かじかむ (kajikamu)

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", "かじかむ" 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..
かじかむ (かじかむ (kajikamu) - Level: N2): Maps to "to become numb with cold; to be benumbed with cold (e.g. hands)" and is used when Specifically describes the sensation of hands or fingers becoming stiff and difficult to move due to cold. It implies the cold has made them numb or clumsy..

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 "かじかむ"

寒さで指がかじかんで、うまく字が書けない。

My fingers are numb with cold, so I can't write well.

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.".