The phrase "haddest one doubts" can be substituted with various synonyms, depending on the context of the sentence. Some possible options include "had reservations," "harbored suspicions," "entertained uncertainties," "questioned," "hesitated," "wavered," "doubted," and "second-guessed." Each of these words conveys a sense of uncertainty or lack of confidence in one's beliefs or actions. By using synonyms, writers can add depth and nuance to their language and demonstrate a more precise understanding of their message. Notably, the choice of synonym can also affect the tone or mood of a sentence, highlighting the writer's attitude towards the doubts expressed.