Webster's Revised Unabridged Dictionary · 1913

insidiousness

insidiousness , noun

A subtle and cumulative harmfulness, especially of a disease.

2.

the quality of being designed to entrap.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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