Proverbs 11:20

It concerns us to know what God hates and what he loves, that we may govern ourselves accordingly, may avoid his displeasure and recommend ourselves to his favour. Now here we are told, 1. That nothing is more offensive to God than hypocrisy and double-dealing, for these are signified by the word which we translate frowardness, pretending justice, but intending wrong, walking in crooked ways, to avoid discovery. Those are of a froward heart who act in contradiction to that which is good, under a profession of that which is good, and such are, more than any sinners, an abomination to the Lord, Isa 65:5. 2. That nothing is more pleasing to God than sincerity and plain-dealing: Such as are upright in their way, such as aim and act with integrity, such as have their conversation in the world in simplicity and godly sincerity, not with fleshly wisdom, these God delights in, these he even boasts of (Hast thou considered my servant Job?) and will have us to admire. Behold an Israelite indeed!

— Matthew Henry's Concise Commentary (public domain)

(Compare Pro 11:5). froward--as in Pro 2:15, opposed to the simplicity and purity of the upright. in their way--or, "conduct."

— Jamieson-Fausset-Brown Commentary (public domain)