Proverbs 24:9

The thought of foolishness is sin: and the scorner is an abomination to men.

The thought (Hebrew, zimat (H2154 ); literally, evil or mischievous counsel) of foolishness (i:e., of the man of foolishness) (is) sin. The man of foolishness - i:e., wickedness-deviseth in his counsel nothing else except sin.

And the scorner (is) an abomination to men - a further step. Hardened "foolishness" - i:e., wickedness-eventually forms the scorner, whose scorn of all things sacred excites the disgust even of men of the world.