de-set' (mirmah; (dolos)):

The intentional misleading or beguiling of another; in Scripture represented as a companion of many other forms of wickedness, as cursing (Psalms 10:7), hatred (Proverbs 26:24), theft, covetousness, adultery, murder (Mark 7:22; Romans 1:29). The Revised Version (British and American) introduces the word in Proverbs 14:25; 2 Thessalonians 2:10; but in such passages as Psalms 55:11; Proverbs 20:17; 26:26; 1 Thessalonians 2:3, renders a variety of words, more accurately than the King James Version, by "oppression," "falsehood," "guile," "error."

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'DECEIT'". "International Standard Bible Encyclopedia". 1915.