insidious
Pronunciation
Adjective
C1 Advanced
Quick answer
Spreading gradually and causing harm without being noticed until it's too late.
Synonyms and antonyms
Test yourself
Which word fits the gap? "The disease progresses in a slow, _____ way that often goes undiagnosed for years."
Answer: insidious
In your own words, what does "insidious" mean?
Spreading gradually and causing harm without being noticed until it's too late.
Learn next at C1
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