infectious - Master This Word
Master this word with our 5-step learning method – Learn English in English
infectious Word Meanings
- capable of causing infection
- spreading quickly and easily
- catching, as in transmitted diseases
infectious Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
infectious Phonetic & Pronunciation
UK
/ɪnˈfɛk.ʃəs/
US
/ɪnˈfɛk.ʃəs/
infectious Word Etymology
in- = not + fect = make + -ious = having the quality of. From Latin 'infectiosus' (meaning infecting) through Old French into English. Picture a muddy river that infects everything it touches, stirring the waters of illness.
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
In English, infectious describes something that can spread from one person to another, or more broadly, anything that seems to spread quickly and easily. It applies to diseases, but also to moods, laughter, or an atmosphere when it catches on within a group. The medical sense is technical and often occurs with phrases like infectious disease or infectious agent. In everyday speech, people may say a mood or enthusiasm is infectious to convey how strongly it spreads. Learners should note that infectious is not used to describe a person being infected; for that, use be infected or infection.
Usage Reminders
- 1) Remember infectious describes capability to spread, not a person being infected.
- 2) Use with diseases or things that can spread (disease, agent, laughter, mood).
- 3) Medical contexts: infectious disease, infectious agent; avoid mixing with infection.
- 4) For metaphorical spread, contagious is often a more natural choice in everyday English.
- 5) The form infectious is usually before a noun (infectious disease, an infectious smile).
Common Misconceptions
- Confusing infectious with infected or infection
- Thinking infectious only applies to illnesses
- Using infectious to describe people who are sick
- Assuming contagious and infectious are always interchangeable
- Seeing the -ous suffix as indicating a mood or atmosphere by itself
Thinking Differences
To English speakers, infectious has two primary senses: disease transmission and metaphorical spread (like laughter or mood). Learners often confuse it with infection or infected, or assume it always refers to a person being sick. English also prefers contagious for everyday spread; reserving infectious for formal or medical contexts.
Learning Tips
- Learn common collocations: infectious disease, infectious agent, infectious laughter.
- Differentiate between infectious and contagious in casual speech.
- Practice pronunciation: in-FECK-shuhs, stress on the second syllable.
- Use synonyms when appropriate: contagious, spreading, transmissible.
- Read medical text and listen to news to see formal usage.
- Create sentences that contrast medical vs metaphorical senses.
5-Step Learning Method - Learn English in English
Step 1: Meaning
What is the meaning of 'infectious'?
A.Spicy
B.Loud
C.Contagious
D.Shiny
Step 2: Usage
Which sentence uses 'infectious' correctly?
A.She painted the room blue.
B.He wore an infectious smile all day.
C.The book was heavy to carry.
D.They went to the beach for vacation.
Step 3: Similar Words
What is a synonym for 'infectious'?
A.Bland
B.Harmless
C.Contagious
D.Potent
Step 4: Opposite Words
What is the opposite of 'infectious'?
A.Isolated
B.Secure
C.Incriminating
D.Daring
Step 5: Mastery
How does the concept of 'infectious' apply to a laughter epidemic?
A.It is controlled easily.
B.It only affects a few people.
C.It causes people to stop laughing.
D.It spreads rapidly among the population.
Related Listening
🔥 Advanced
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