i Register
In some senses, insubordinate is marked as informal. Watch for register when choosing this word.
adj
Rebellious or defiant to authority; contumacious.
I remembered with confusion my insubordinate and stealthy conduct, and when I saw where it had brought me […] I felt ashamed to look him in the face.
verb
To rebel or defy authority.
I think it's moral to insubordinate against a controlling boss.
noun
A person who defies authority.