The phrase "most god-awful" is used to describe something that is extremely terrible or unpleasant. Antonyms for this phrase would be words that describe something as great, wonderful, or pleasant. These words could include fantastic, delightful, superb, enjoyable, marvelous, and terrific. Alternatively, words like tolerable, acceptable, or satisfactory could be used to describe something that is adequate but not exceptional. The choice of antonyms would depend on the context in which the phrase is being used and the degree to which the speaker wants to convey positivity.