| border(noun, top, line, limit, edge) |
| doubtful(adjective, clear, open, delicate, certain) |
| boundary(noun, mark, top, limit, stroke) |
| edge(noun, mark, top, limit, stroke) |
| marginal(adjective, inexact) |
| unclear(adjective, clear, open, certain, uncertain) |
| equivocal(adjective, clear, open, delicate, certain) |
| frontier |
| line(noun, mark, stroke, border) |
| ambiguous(adjective, clear, open, delicate, certain) |
| margin(noun, edge) |
| mete |
| problematic(adjective, clear, delicate, certain, uncertain) |
| uncertain(adjective, clear, open, delicate, certain) |
| unsure(adjective, clear, open, delicate, certain) |
| verge(noun, limit, edge, border, extremity) |
| boundary line(noun, expression, idiom) |
| dubitable(adjective, clear, certain, uncertain, doubtful) |
| end(noun, top, limit, extreme, edge) |
| indecisive(adjective, clear, open, delicate, certain) |