Definitivenesses are characterized by their clear and absolute nature, leaving little room for ambiguity or uncertainty. Antonyms for this concept might include vagueness, indecisiveness, or ambiguity. These words suggest a lack of clarity or precision, and may connote confusion or hesitancy. Additionally, words such as equivocation or ambivalence may be considered antonyms of definitivenesses, as they imply a lack of commitment or a tendency to waver in one's assertions. While definitivenesses are often associated with strength and confidence, their antonyms may suggest weakness or a lack of conviction. Ultimately, the choice between these contrasting concepts will depend on the specific context and tone of the writing in question.