Dead flies. Hebrew flies of death: i.e. flies that bring or produce death. Supply the Figure of speech Ellipsis, "[as] dead".
cause. [are that which will] cause, &c.
to send forth. stinking savour. to stink [and] fer-ment. Figure of speech Hendiadys. App-6.
folly. stupidity. Hebrew. sakal. Same root as in Ecclesiastes 10:6. See note on Proverbs 1:7.
him. Note the Figure of speech Ellipsis (App-6) : "So doth stupidity [cause] him that is in reputation for wisdom and honour [to send forth an offensive savour]".
wisdom. Hebrew. chakmah. See note on Ecclesiastes 1:2.