radical
gb/ɹˈædɪkəl/ us/ɹˈædɪkəl/
B1
英語
~ 2600
語義
0件の語義
adjective
B2
property
1
Extreme or far from the usual
Very different from normal or traditional; extreme.
用法パターン：
[someone/something] is radical
よくある間違い：
Learners sometimes confuse 'radical' with 'rad', which is slang for 'cool' and not appropriate in formal contexts.
類義語
extreme (More general and can apply to degree or intensity without implying novelty or change.)
|
revolutionary (Suggests bringing about major change, often political or social.)
対義語
moderate (Implies avoiding extremes and preferring gradual change.)
コロケーション
radical change
|radical reform
|radical idea
|radical approach
|radical solution
テーマ
politics
|society
|change
|core_vocabulary
例文
- The new leader proposed a radical change to the education system.
- Her views on environmental policy are considered radical by many.
- The company adopted a radical approach to solving the problem.
- He made a radical decision to quit his job and travel the world.
- This was a radical departure from their usual style.
学習者向け例文
- This is a radical idea.
- The city needs radical changes.
- She has radical plans for the school.
- He wants a radical new law.
- It was a radical move by the team.
名詞
B2
entity
2
Person with extreme views
A person who wants big changes in politics or society.
用法パターン：
[someone] is a radical
類義語
extremist (Often more negative, can imply willingness to use force or violence.)
対義語
moderate (Supports gradual change rather than extreme measures.)
コロケーション
political radical
|social radical
|left-wing radical
テーマ
politics
|society
|relationships
例文
- The radicals in the movement demanded immediate action.
- He was seen as a radical during his university days.
- Some radicals were arrested during the protest.
- The party's radicals opposed the compromise.
- She has been labeled a radical for her beliefs.
学習者向け例文
- He is a radical in politics.
- The group has many radicals.
- She is called a radical by her friends.
- Some radicals want fast change.
- Radicals often fight for new ideas.
adjective
informal
B1
property
3
Excellent or impressive (slang)
(Slang) Very good or cool.
用法パターン：
[something] is radical
よくある間違い：
Learners may use this slang in formal situations where it is inappropriate.
類義語
awesome (Very informal, similar casual tone.)
|
cool (Informal, common in youth speech.)
対義語
lame (Slang for boring or unimpressive.)
コロケーション
radical design
|radical performance
テーマ
slang
|youth_culture
|communication
|core_vocabulary
例文
- That skateboard trick was totally radical!
- The concert last night was radical.
- Your new bike looks radical!
学習者向け例文
- The movie was radical.
- His car is radical.
- That game is radical.
名詞
technical
C1
entity
4
Group of atoms in chemistry
(Chemistry) A group of atoms that act together in reactions.
コロケーション
free radical
テーマ
science
|chemistry
例文
- Free radicals can damage cells and lead to aging.
- A hydroxyl radical is highly reactive.
- Chemists study how radicals affect reactions.
学習者向け例文
- Free radicals can harm the body.
- A radical can change other molecules.
- Some radicals react very fast.
名詞
technical
B2
entity
5
Mathematical root symbol or value
(Math) The √ sign or the number under it that shows a root.
コロケーション
square root radical
テーマ
mathematics
|education
|science
例文
- In √9, the radical sign indicates a square root.
- The expression under the radical is 16.
- Simplify the radical before solving the equation.
学習者向け例文
- The radical sign means root.
- We see a radical in this math problem.
- A radical can show a square root.
文法
辞書形
radical
IPA
GB/ɹˈædɪkəl/
US/ɹˈædɪkəl/
音節・強勢
rad - ic - al （3音節）
Stress on 1st syllable (rad)
活用形
Adjective
- Base: radical
Noun
- Base: radical
- Plural: radicals
関連語
Forms
radicals
noun
Core family
radically
adverb B2
Related words
radicalism
noun
Negative and opposite forms
moderate
adjective B1
Advanced or less common
radicalize
verb
radicalization
noun C1
表現
free radical
1/fɹˈi ɹˈædɪkəl/
fixed phrase
technical
Atom/molecule with unpaired electron
An atom or molecule that has an unpaired electron and can react easily.
例文
- Free radicals can cause damage to cells.
- Antioxidants help neutralize free radicals.
radical change
1/ɹˈædɪkəl t͡ʃˈeɪnd͡ʒ/
fixed phrase
Major and complete transformation
A big and complete change.
例文
- The country needs a radical change in its energy policy.
- Radical change is necessary to solve the crisis.
radical reform
1/ɹˈædɪkəl ɹɪfˈɔɹm/
fixed phrase
Thorough alteration of system/law
A big and complete change to laws or systems.
例文
- The education system requires radical reform.
- Radical reform of the tax code is long overdue.