lethargy
gb/lˈɛθɚd͡ʒi/ us/lˈɛθɚd͡ʒi/
C1
英語
語義
0件の語義
名詞
C1
state
1
extreme tiredness and low energy
A strong feeling of being very tired and having no energy.
用法パターン：
lethargy in [someone]; a feeling of lethargy; suffer from lethargy
よくある間違い：
Learners often use *lethargy* like an adjective (incorrect: “I am lethargy”); use *lethargic* or say “I feel lethargy / I feel lethargic.”
類義語
fatigue (Often suggests physical or mental tiredness from effort; can be more neutral/medical.)
|
sluggishness (Emphasizes slow movement or low energy rather than sleepiness.)
|
weariness (More literary; suggests being tired over time.)
対義語
energy (The ability and readiness to be active.)
|
vitality (Strong, healthy energy and liveliness.)
|
alertness (Being awake and attentive rather than sleepy.)
コロケーション
a feeling of lethargy
|a sense of lethargy
|overcome with lethargy
|morning lethargy
|persistent lethargy
|unexplained lethargy
|sudden lethargy
|lethargy and fatigue
|combat lethargy
|cause lethargy
テーマ
health
|daily_life
|body_and_mind
例文
- After the long flight, a heavy lethargy settled over her and she went straight to bed.
- He blamed his midweek lethargy on too little sleep and too much screen time.
- If the lethargy lasts more than a few days, it’s worth talking to a doctor.
学習者向け例文
- I feel lethargy today because I didn’t sleep well.
- A short walk can help with lethargy.
名詞
formal
C1
state
2
lack of activity or progress
A situation where people or things are not active and nothing changes much.
用法パターン：
lethargy in [an organization/market]; fall into lethargy; political/economic lethargy
よくある間違い：
Don’t confuse with *apathy*: apathy is lack of interest; lethargy emphasizes low energy or slow action.
類義語
inertia (Stresses failure to change or move forward, often despite pressure.)
|
stagnation (Focuses on lack of growth or development over time.)
|
sluggishness (Suggests slow speed or weak activity, often in markets or processes.)
対義語
momentum (A building force of progress and activity.)
|
dynamism (Energetic change and initiative.)
|
activity (General busyness and movement.)
コロケーション
economic lethargy
|political lethargy
|institutional lethargy
|bureaucratic lethargy
|market lethargy
|break out of lethargy
|shake off lethargy
|a period of lethargy
|widespread lethargy
|post-crisis lethargy
テーマ
business
|society
|work
例文
- The new manager was hired to shake the team out of its lethargy.
- After months of lethargy, sales finally began to pick up.
- Voter turnout reflected a broader political lethargy in the city.
学習者向け例文
- The project fell into lethargy and stopped moving forward.
- New ideas helped the company escape its lethargy.
名詞
technical
C2
state
3
abnormally sleepy, slow responsiveness
In medical use, being unusually sleepy and slow to react.
用法パターン：
lethargy as a symptom of [illness]; medication-induced lethargy
よくある間違い：
In everyday English it can just mean “low energy”; in medical contexts it implies abnormal sleepiness and reduced responsiveness.
類義語
drowsiness (Sleepiness; often milder and more common in non-clinical speech.)
|
somnolence (More technical term for sleepiness.)
対義語
responsiveness (Ability to react quickly and appropriately.)
|
wakefulness (The state of being fully awake.)
コロケーション
marked lethargy
|extreme lethargy
|mental lethargy
|lethargy and confusion
|lethargy and drowsiness
|symptoms include lethargy
|lethargy following infection
|medication-induced lethargy
|present with lethargy
|lethargy in children
テーマ
health
|medicine
例文
- The clinician noted lethargy and slow responses during the examination.
- Call a doctor if a child has a fever with unusual lethargy.
- Some antihistamines can cause lethargy, especially at higher doses.
学習者向け例文
- The medicine caused lethargy.
- The doctor asked about lethargy and other symptoms.
文法
辞書形
lethargy
IPA
GB/lˈɛθɚd͡ʒi/
US/lˈɛθɚd͡ʒi/
音節・強勢
leth - argy （2音節）
Stress on 1st syllable (leth)
活用形
Noun
- Base: lethargy
- Plural: lethargies, lethargy
関連語
表現
a bout of lethargy
1/ə bˈaʊt əv lˈɛθɚd͡ʒi/
fixed phrase
a short period of low energy
A short time when you feel very tired.
例文
- I had a bout of lethargy last week, but it passed after a few days.
- After the flu, he experienced a bout of lethargy and stayed home to rest.
afternoon lethargy
1/ˌæftɚnˈun lˈɛθɚd͡ʒi/
fixed phrase
tiredness in the afternoon
Feeling tired in the afternoon.
例文
- Coffee helps, but it doesn’t completely fix my afternoon lethargy.
- The meeting was scheduled for the morning to avoid afternoon lethargy.
economic lethargy
1/ˌɛkənˈɑmɪk lˈɛθɚd͡ʒi/
fixed phrase
business
slow, weak economic activity
A time when the economy is weak and slow.
例文
- The central bank cut rates to counter economic lethargy.
- Small businesses struggled during a period of economic lethargy.
post-lunch lethargy
1/pˈoʊst lˈʌnt͡ʃ lˈɛθɚd͡ʒi/
fixed phrase
sleepiness after eating lunch
Feeling sleepy after lunch.
例文
- I switched to a lighter meal to avoid post-lunch lethargy.
- A short walk helps me beat post-lunch lethargy at work.
winter lethargy
1/wˈɪntɚ lˈɛθɚd͡ʒi/
fixed phrase
low energy in winter
Feeling low energy in winter.
例文
- She uses a light lamp to help with winter lethargy.
- Regular exercise can reduce winter lethargy.