The antonyms for the phrase "hath doubts" are "confident," "assured," "certain," "decisive," "conviction," "trustful," "positive." When someone "hath doubts," they are unsure about something and lack confidence in their decision or belief. On the other hand, when they are "confident," they trust their judgment and have a strong belief in their actions. Similarly, "assured" and "certain" both indicate a complete absence of doubt. Being "decisive" means that someone can make firm, quick decisions without hesitation. While "conviction" denotes a strong belief, "trustful" and "positive" refer to a person's firm belief in someone or something.