Final answer:
Duncan's attitude toward Macbeth in Act 1 is positive and complimentary. In the first act, Duncan refers to Macbeth as 'noble' and praises his victory.
Step-by-step explanation:
Duncan's attitude toward Macbeth in the play's first act can be described as positive and complimentary. In Act 1, Scene 2, Duncan refers to Macbeth as 'noble' and greets him with praises for his victory in battle:
Duncan. What he hath lost noble Macbeth hath won.
This passage shows that Duncan holds Macbeth in high regard and believes him to be a worthy and honorable individual.