Meaning of the word insidious in English

What does insidious mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

insidious

US /ɪnˈsɪd.i.əs/
UK /ɪnˈsɪd.i.əs/

Adjective

1.

(of something unpleasant or dangerous) gradually and secretly causing harm:

Example:
High blood pressure is an insidious condition which has few symptoms.
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