"not willingly" is a contrast. it indicates that "willingly" exists.
I have been writing about man not being imparted a free-will based upon scripture containing no such impartation.
By the way, "not willingly" does not indicate that "willingly" exists, rather "not willingly" only indicates that "not willingly" exists; therefore, you are adding "willingly" to the scripture in Romans 8:20.
The Apostle Paul wrote of man's will and man's work as the work of God in man with "it is God who is at work in you, both to will and to work for [His] good pleasure" (Philippians 2:13), so with Paul I say man does have a will (noun).
THE APOSTLE PAUL CONVEYED THAT MAN HAS A BOND-WILL, NOT A FREE-WILL, BUT A BOND-WILL IN PHILIPPIANS 2:13!
Largely, I use free-will to mean man choosing toward God, emphatically Lord Jesus Christ.
There is no level that a person can choose Lord Jesus because He says "you did not choose Me, but I chose you" (John 15:16) as well as "I chose you out of the world" (John 15:19, includes salvation) - Jesus, being God, did not provide any exception for choosing toward Jesus. Lord Jesus speaks to all believers in all time because He also said "I do not ask on behalf of these alone, but for those also who believe in Me through their word" (John 17:20)! All these words of Jesus are at the same supper! All glory is God's! With man, salvation is impossible (Matthew 19:25-26)! All glory in the salvation of man is God's (John 15:5, Isaiah 42:8, Psalm 3:8)!
You think your word is so very important that you dictate to God as you add to and subtract from scripture.
Still, no free will written in the creation account (Genesis 1:1-31 Genesis 2:1- 25 Genesis 3:1-24), with Paul in accord for he conveyed that Adam "not willingly" ate of the tree since Paul included all time prior to Paul's birth by his writing "until now" (Romans 8:20-22).
Just as the original post shows richly in scripture, Adam was not imparted free will, and no man thereafter was imparted free will neither.