Charles Ellicott Commentary Psalms 119:118

"Thou hast set at nought all them that err from thy statutes; For their deceit is falsehood." — Psalms 119:118 (ASV)

Trodden down.—Better: you despise. So the Septuagint, Vulgate, and Aquila: “You have impaled.” Symmachus: “You have convicted.” Literally, the word seems to mean to weigh or value, but, from the habit of the buyer beating down the price by depreciating, comes to have this kind of sense. Mr. Burgess aptly quotes Proverbs 20:14. We may compare the English word cheapen, which originally only meant to buy.

For their deceit is falsehood.—Rather, as the parallelism indicates, for their tricks are in vain; or perhaps, to bring out the full intention of the Hebrew, we must paraphrase: “for their wiles are as fruitless as they are deceitful.” So Symmachus: “all their craft is vain.”