The phrase "feeling in gut" is often used to describe a visceral or instinctual sensation of discomfort or unease. Antonyms for this phrase would include words that represent a lack of physical or emotional discomfort, such as comfortable, relaxed, and at ease. Other antonyms might include words that represent an intellectual or rational approach, such as analytical, logical, or reasoned. Alternatively, antonyms might represent a more positive or optimistic outlook, such as hopeful, optimistic, or confident. Ultimately, the antonyms for "feeling in gut" depend on the context and tone of the phrase, as well as the specific connotations and associations of the words chosen.