insidiousadjective
uk/ɪnˈsɪd.i.əs/us/ɪnˈsɪd.i.əs/(of something unpleasant or dangerous) gradually and secretly causing harm:
High blood pressure is an insidious condition which has few symptoms.
Thesaurus: synonyms and related words
Dangerous and harmful
- adverse
- apocalyptic
- biohazard
- damaging
- deleterious
- do more harm than good idiom
- favour
- forbidding
- gnarly
- harm
- harmful
- kiss
- negative
- penal
- pernicious
- rogue
- ruinous
- self-destruct
- stinking thinking
- toxic
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insidiously
adverb uk/ɪnˈsɪd.i.əs.li/us/ɪnˈsɪd.i.əs.li/
The disease begins insidiously and progresses relentlessly.
insidiousness
noun [ U ] uk/ɪnˈsɪd.i.əs.nəs/us/ɪnˈsɪd.i.əs.nəs/
We must recognise the insidiousness of these racial stereotypes.