Explanation:

- Ominous: This word suggests that something bad or unpleasant is going to happen. It carries a sense of foreboding or threat.

- Option 1: Pleasant: This describes something enjoyable or agreeable, which is good but not directly opposing the concept of a forewarning of doom.

- Option 2: Encouraging: This suggests providing hope or confidence, showing support or inspiration.

- Option 3: Auspicious: This is used to describe circumstances that point towards future success or good fortune. .

- Option 4: Favorable: This word also hints at positive or advantageous circumstances, but not as directly linked to predicting good omens as "auspicious."