English version


From Longman Dictionary of Contemporary Englishinsidiousin‧sid‧i‧ous /ɪnˈsɪdiəs/ adjective formal  BADan insidious change or problem spreads gradually without being noticed, and causes serious harm an insidious trend towards censorship of the pressinsidiously adverbinsidiousness noun [uncountable]
Examples from the Corpus
insidiousA more insidious form of water pollution is chemicals used on farms that get into the water supply.
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