borderline Synonyms

delimitation boundary line marginal mete border bounds confines undecided unsettled watershed borders verge uncertain threshold separatrix selvage questionable problematic periphery property line borderland border line limits wiggly untrusty unclassifiable piratically unsure unclear iffy liminal offside marginality dividing line limbic demarcation line marchland perimetric perimeter moot dubious doubtful division divide demarcation debatable cut-off circumscription circumference brink