infirm - Master This Word
Master this word with our 5-step learning method – Learn English in English
infirm Word Meanings
- not physically or mentally strong
- weak or ill
- feeble or unfit
infirm Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
infirm Phonetic & Pronunciation
UK
/ɪnˈfɜːm/
US
/ɪnˈfɜrm/
infirm Word Etymology
infirm = in- (not) + firm (strong). Historical origin: Latin 'infirmus' → Old French 'enferme' → English. Memory image: Imagine a broken wall that cannot stand firm, representing weakness.
Note 1: These definitions and etymologies are not standard dictionary definitions, but extended explanations provided to help with memorization and understanding of the actual application of words. Through this background information, we strive to make words more vivid and easier to understand, and help you remember their meanings in real life.
Note 2: LexiTalk designs the learning flow around the linguistics principle of “Comprehensible Input.” When learners encounter material that is slightly above their level but still understandable from context, the brain naturally absorbs the language. That’s why we keep every word inside authentic contexts, using examples and associations to help you understand it and use it flexibly.
Read the FAQ explanation of Comprehensible InputReal Context
Infirm means not physically or mentally strong; weak or ill; feeble or unfit. It comes from in- (not) + firm (strong). Historically, infirmus in Latin and infirm in Old French and English described someone who was lacking strength or health. In modern usage it is more formal and often medical or literary; you may see infirmary, infirmities, or phrases like 'infirm state' to describe weakness or frailty. A memory image is a cracked wall that cannot stand firm, symbolizing weakness. Learners should note that infirm often implies long-standing weakness or frailty, not a temporary mood; it is less common for everyday symptoms than 'sick' or 'weak' and can sound old-fashioned in casual speech.
Usage Reminders
- Not always physical; can be mental weakness too
- Formal or medical tone, not everyday speech
- Applies to people and sometimes things that are structurally weak
- Often implies long-term frailty rather than a fleeting symptom
- Pairs with related forms: infirmary, infirmities, infirm state
- Avoid confusing with 'firm' or with 'ill' in casual conversation
Common Misconceptions
- Infirm means the same as sick
- It is only used for people, not objects
- It is casual and modern English
- It describes temporary discomfort rather than long-term weakness
- It relates to moral strength or character
Thinking Differences
In English we often reserve infirm for formal, medical, or literary contexts; it signals long-term weakness more than a temporary symptom. Learners tend to confuse it with sick, weak, or ill, or mistake it as casual language because of its -firm root. Remember it pairs with medical terms like infirmary and infirmities rather than everyday adjectives.
Learning Tips
- Compare infirm with sick and weak to feel the nuance
- Note its formal, medical tone and occasional literary feel
- Look for related forms: infirmary and infirmities
- Practice with people and things that are long-term fragile
- Use the memory image of a wall that cannot stand firm
- Avoid casual uses in everyday speech
5-Step Learning Method - Learn English in English
Step 1: Meaning
What is the meaning of the word 'infirm'?
A.Strong
B.Healthy
C.Frail
D.Energetic
Step 2: Usage
Which of the following best describes how 'infirm' is used in this sentence: 'The elderly man was too infirm to walk without assistance'?
A.Full of energy
B.Physically weak
C.Mentally sharp
D.Flexible
Step 3: Similar Words
Which word is a synonym of 'infirm'?
A.Feeble
B.Robust
C.Vibrant
D.Resilient
Step 4: Opposite Words
What is the opposite of 'infirm'?
A.Strong
B.Sturdy
C.Healthy
D.Vigorous
Step 5: Mastery
In what situation would you use the word 'infirm'?
A.Talking about someone who just ran a marathon
B.Describing an elderly person who needs care
C.Discussing a professional athlete's training routine
D.Referring to a young student in excellent health
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