insidious
adjectiveStress: second syllable
Syllables: in-sid-i-ous (4)
English Definition
Proceeding in a gradual, subtle way, but with very harmful effects.
Example Sentence
The disease has an insidious onset and is difficult to detect.
US IPA
/ɪnˈsɪd.i.əs/
UK IPA
/ɪnˈsɪd.i.əs/