Bright-line is a term often used in law and policy to refer to clear and definitive standards or rules. Antonyms for this term might include ambiguous, unclear, vague, or murky. These terms suggest a lack of clear and definitive boundaries or guidelines, leaving room for interpretation or misinterpretation. Other antonyms for bright-line might include fuzzy, hazy, imprecise, or uncertain. These terms highlight the importance of clarity and specificity in setting policies or making decisions. While a bright-line standard can provide a sense of certainty and predictability, its antonyms suggest a potential for confusion or ambiguity.