The phrase "hast mind" is an old-fashioned term that means to have an inclination or desire to do something quickly. Antonyms for this phrase would include words that suggest a lack of urgency, such as "leisurely," "restrained," or "patient." Other antonyms might include words that describe hesitation or reluctance, such as "hesitant," "undecided," or "hesitant."
In general, antonyms for "hast mind" would suggest a more cautious or thoughtful approach to decision-making, rather than rushing headlong into a particular action or activity. Whatever antonym one chooses, the important thing is to remember that careful consideration and thoughtful contemplation are often just as valuable as swift action in achieving one's goals and objectives.