The opposite of "commits" (does, as with a crime) would be does not commit, which like many actions could mean to eschew or avoid.
The opposite of "commits" (assumes an obligation by choice) could be defers, vacillates, wavers, or waffles.
Commits- like: she commits a crime.
A person who commits a homicide is a murderer.
A person who commits sin is called a sinner.
A person who commits a robbery is known as a robber or a thief.
no
Al, a fellow transfer with Tris
A traitor.
me!
he commits adultery
Othello
Yes, a person that commits a crime has a choice to choose a lawyer or represent themselves.
The cast of The Day She Commits Suicide - 2013 includes: Reika Miwa