He that hath a froward heart findeth no good: and he that hath a perverse tongue falleth into mischief.
– Proverbs 17:20
The wicked are described as having a froward heart (Proverbs 3:32; 6:12-15; 11:20). This means a perverse mind, bent toward folly and away from wisdom. All their plans are plans of wickedness and abominations before the Lord. The wicked are also described as having a perverse tongue (Proverbs 8:13; 10:10; 18:6-7). The word for perverse means to turn about or over. This refers to a false tongue, saying one thing and doing another. One who thinks and talks this way cannot expect to find good and can expect to find mischief, or evil (Proverbs 10:31; 13:17).