Most clinching refers to something that is conclusive and convincing. Antonyms for this phrase can be words that describe something that is uncertain, unconvincing, or inconclusive. The antonym for most can be least, which suggests that the evidence presented is insufficient. The antonym for clinching can be inconclusive, flimsy, or weak, which implies that the argument lacks sufficient support to convince someone. Other antonyms can be ambiguous, dubious, or vague, which suggests that the evidence presented is unclear and the argument remains unresolved. Thus, the antonyms for most clinching are words that describe something that lacks clarity, certainty, and conclusive evidence.