effective
gb/ɪfˈɛktɪv/ us/ɪfˈɛktɪv/
B1
英語
~ 1100
語義
0件の語義
adjective
B1
property
1
Producing the desired result
Able to produce the result you want.
用法パターン：
[something] is effective at [doing something]
よくある間違い：
Learners sometimes confuse 'effective' with 'efficient'. 'Effective' means it works well, while 'efficient' means it works well with little waste.
類義語
successful (Emphasizes achieving a goal, sometimes with broader scope than 'effective'.)
|
efficient (Focuses on achieving results with minimal waste of time or resources.)
対義語
ineffective (Direct opposite; fails to produce the intended result.)
|
useless (Stronger and more negative; of no practical use.)
コロケーション
highly effective
|effective method
|effective strategy
|effective communication
|effective treatment
テーマ
business
|daily life
|problem solving
|core_vocabulary
|work
例文
- This new medicine is highly effective against the virus.
- The training program was effective in improving staff performance.
- Her speech was effective in changing public opinion.
- Regular exercise is effective at reducing stress.
- The new policy proved effective after just a few weeks.
学習者向け例文
- The new rules are effective in schools.
- This cream is effective for dry skin.
- Exercise is effective for good health.
- The plan is effective and easy to follow.
adjective
formal
B2
property
2
In operation from a given time
Starting to be used or done from a certain time.
用法パターン：
effective [date/time]
よくある間違い：
Learners may confuse this meaning with 'effective' meaning 'good at producing results'; here it refers to the start of official use.
類義語
operative (More technical/legal term for being in force.)
対義語
expired (No longer valid or in effect.)
コロケーション
effective immediately
|effective date
|effective from
|effective as of
テーマ
law
|business
例文
- The new law will be effective from January 1st.
- The changes are effective immediately.
- Her promotion is effective as of next Monday.
- The policy becomes effective upon signature.
学習者向け例文
- The rule is effective today.
- My new job is effective next week.
- The law is effective from May 1.
adjective
formal
C1
property
3
Existing in fact, not formally recognized
Real or true in fact, even if not official.
類義語
actual (Emphasizes real existence regardless of formal status.)
対義語
nominal (Refers to something existing in name only without real power or effect.)
コロケーション
effective leader (de facto)
|effective control
|effective power
テーマ
law
|politics
|core_vocabulary
例文
- He is the country's effective ruler, though not elected.
- They have effective control over the region.
- She became the effective head of the department after her boss resigned.
学習者向け例文
- She is the effective boss here.
- He has effective control of the team.
- They are the effective leaders now.
文法
辞書形
effective
IPA
GB/ɪfˈɛktɪv/
US/ɪfˈɛktɪv/
音節・強勢
ef - fect - ive （3音節）
Stress on 2nd syllable (fect)
活用形
Adjective
- Base: effective
関連語
Core family
Negative and opposite forms
表現
effective date
1/ɪfˈɛktɪv dˈeɪt/
fixed phrase
formal
Official start date of something
The day when something starts to be used or done by law or rule.
例文
- The contract's effective date is July 1st.
- Check the policy's effective date before signing.
effective immediately
1/ɪfˈɛktɪv ɪmˈidiɪtli/
fixed phrase
formal
Starting now without delay
Starting right now, without waiting.
例文
- Your suspension is effective immediately.
- The price increase is effective immediately.