Verse 3 from the other side. 15:8 says the same thing and adds what God does delight in.
Quick answer
The offering was already unacceptable. Bringing it as part of a scheme makes it worse, and the verse says so with an exclamation.
Read both lines
The first line states the baseline without explaining it, which 15:8 fills in: the sacrifice of the wicked is an abomination to the LORD, but the prayer of the upright is His delight. Then this verse escalates with the "how much more" construction the book uses for arguing from a lesser case to a greater. The phrase behind "wicked intent" is about a scheme or a plan, so the man is not merely unrepentant, he is using the offering as a move. Twenty-four verses after saying justice outranks sacrifice, the chapter closes the same argument by showing what sacrifice looks like when the justice is missing.
Related: Proverbs 21:3 · Proverbs 15:8 · Proverbs 28:9 · Proverbs 15:29
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.