Final answer:
Macbeth uses the word 'perfect' to mean calm and composed.
Step-by-step explanation:
In this context, the word 'perfect' means calm and composed. Macbeth uses the word to describe a state of being whole and solid like marble. He is expressing that he would have been calm and composed if things had happened differently. The line suggests that Macbeth's actions have caused him to become agitated and disturbed.