Vocabulary Cards
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C1 adjective
invaluable
計り知れない価値がある
Meaning
Extremely useful or indispensable.
Example
Her advice proved invaluable to my success.
C1 adjective
Invariable
不変の; 一定の; 常に同じ
Meaning
never changing; constant; always the same
Example
His invariable routine includes morning exercise and coffee.
B2 noun
invasion
侵略
Meaning
An instance of invading a country, region, or personal space with armed force or unwelcome presence.
Example
The army prepared for the possibility of an invasion.
C1 adjective
invasive
侵襲的
Meaning
Tending to spread harmfully, intruding aggressively, or encroaching beyond proper boundaries.
Example
The doctor explained that the procedure was minimally invasive.
C2 noun
invective
侮辱的な言葉
Meaning
Insulting, abusive, or highly critical language.
Example
The politician’s speech was filled with invective against his opponents.
C2 verb
inveigh
激しく批判する
Meaning
To speak or write about something with great hostility and criticism.
Example
He inveighed against the corruption in government.
C2 verb
inveigle
誘惑する
Meaning
To persuade someone to do something by deception or flattery.
Example
She inveigled him into signing the contract.
B1 verb
invent
発明する
Meaning
to create or design something that has not existed before
Example
Thomas Edison invented the electric bulb.
B1 noun
invention
発明
Meaning
The action of inventing something, typically a process or device.
Example
The invention revolutionized communication.
C1 adjective
inventive
創造的
Meaning
Having the ability to create or design new things or to think originally.
Example
The inventor was known for his inventive solutions to everyday problems.
B2 noun
inventor
発明家
Meaning
a person who creates or designs something new, especially a device, method, or process
Example
The inventor patented her new medical device.
B2 noun
inventory
インベントリ
Meaning
A complete list of items, such as goods in stock or property.
Example
The shopkeeper checked the inventory before opening the store.
C1 adjective
Inverse
逆の; 反対の
Meaning
opposite in order, nature, or effect; reversed
Example
There is an inverse relationship between price and demand.
C1 adverb
Inversely
逆に; 反対に
Meaning
in a way that is opposite or contrary; in reverse order or manner
Example
The price of goods is inversely related to their availability in the market.
C1 noun
inversion
逆転
Meaning
A reversal of the normal order, position, or relationship.
Example
In poetry, inversion is often used to create emphasis.
C1 verb
invert
逆さにする
Meaning
To turn something upside down or in the opposite position, order, or direction.
Example
He inverted the glass to let the water drain out.
B1 verb
invest
投資する
Meaning
To put money, effort, time, etc. into something to make a profit or get an advantage.
Example
Investing in intellectual property can generate passive income.
B1 verb
investigate
調査する
Meaning
to carry out a systematic inquiry to discover facts or information
Example
The police will investigate the incident thoroughly.
B1 noun
investigation
調査
Meaning
the process of inquiring into or examining something carefully to find the truth
Example
The investigation revealed new evidence about the fraud.
B2 noun
investigator
幸福
Meaning
a person who carries out a formal inquiry or investigation
Example
The investigator gathered evidence from the crime scene.
B2 verb
investing
投資
Meaning
The act of putting money into financial schemes, shares, property, or a commercial venture with the expectation of achieving a profit.
Example
Investing in stocks can generate long-term wealth.
C2 noun
investiture
任命式
Meaning
the formal ceremony of conferring authority, rank, or office
Example
The king held an investiture ceremony for the new knight.
B1 noun
investment
投資
Meaning
The action or process of investing money for profit or material result.
Example
Investment in waste management infrastructure is essential.
B1 noun
investor
投資家
Meaning
a person or organization that puts money into financial schemes, property, or business ventures with the expectation of achieving a profit
Example
The investor funded the startup with a large sum of money.