The phrase "am delirious" implies a state of confusion and disorientation. In contrast, its antonyms suggest a state of clarity and coherence. For example, "am clear-headed" denotes a state of rational thinking, while "am lucid" suggests a calm and composed mental state. Similarly, "am level-headed" implies a thoughtful and considered approach. "Am sound of mind" connotes mental stability and balance, while "am sensible" suggests a practical and grounded outlook. Finally, "am in my right mind" implies a sense of normalcy and rationality, making it the most direct antonym of "am delirious.