Definition of insidiousness in English:

insidiousness

noun

  • See insidious

    • ‘I don't underestimate the insidiousness of both visible and hidden surveillance technologies.’
    • ‘But for five Irish teenagers, the magnifying glass doesn't reveal the insidiousness of California - it only inflates its lure and significance.’
    • ‘Asthma has become a common ailment in modern society, as the deteriorating environment and stress work their insidiousness against the human body.’
    • ‘Slowly, with an insidiousness no one recognized, those businesses began to disappear until now many of the buildings sit empty and abandoned.’
    • ‘Indulged and defended by successive Mail editors he continued to highlight the insidiousness of the apartheid regime and its increasing desperation.’

Pronunciation

insidiousness

/ɪnˈsɪdɪəsnəs/