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insidious meaning in Russian

EnglishRussian
insidious (producing serious harm in a stealthy, often gradual, manner)
adjective
[UK: ɪn.ˈsɪ.dɪəs]
[US: ˌɪn.ˈsɪ.diəs]

коварныйadjective

скрытыйadjective