Definitiveness is the quality of being certain or conclusive. Antonyms for definitiveness are uncertainty, vagueness, ambiguity, indecisiveness, and equivocality. Uncertainty refers to a lack of confidence or knowledge about something. Vagueness implies lack of clarity or precision in expression, thought or understanding. Ambiguity denotes the existence of multiple meanings or interpretations. Indecisiveness implies a state of being unable to make a decision. Equivocality refers to the use of ambiguous language that could be interpreted in different ways. While definitiveness is desirable in most situations, the antonyms can be useful in cases where open-endedness or flexibility is desired.