The phrase "fixt to" is a colloquial expression that generally means "prepared to" or "ready to." However, the antonyms for "fixt to" depend on the context in which it is used. For instance, if it implies a sense of determination, its antonyms can be hesitant, uncertain, or indecisive. Alternately, if it implies a sense of urgency or eagerness, its antonyms can be languid, lazy, or indifferent. It's essential to understand the nuances of a word or phrase's meaning to identify its antonyms, and in this case, it's no different. Ultimately, the antonym of "fixt to" would rely heavily on the context in which it is used.