Be not over much wicked. Be not very wicked: i.e. Be not wicked at all. For violation of nature's laws surely end in premature death.
foolish. stupid. Hebrew. sakal; not the same word as in verses: Ecclesiastes 4:5; Ecclesiastes 4:6; Ecclesiastes 4:9, Ecc 4:25 ("folly"). See note on Proverbs 1:7.
why... ? Figure of speech Erotesis. App-6.