| questionable(adjective, clear, certain, uncertain, doubtful) |
| undecided(adjective, open, uncertain, definite, doubtful) |
| delimitation |
| dubious(adjective, clear, open, delicate, certain) |
| fringe(noun, edge, trim, border, frontier) |
| indefinite(adjective, open, uncertain, vague, unclear) |
| liminal |
| limit(noun, mark, top, stroke, extreme) |
| moot(adjective, ambiguous) |
| perimeter(noun, edge, border, frontier, trimming) |
| open(adjective, uncertain, nervous, unstable, doubtful) |
| brink(noun, edge, trim, border, frontier) |
| compass |
| suspicious(adjective, uncertain, nervous, doubtful, unsettled) |
| threshold(noun, edge, border, frontier, transitional) |
| unsettled(adjective, open, delicate, uncertain, unstable) |
| unstable(adjective, delicate, uncertain, nervous, doubtful) |
| clouded(adjective, clear, certain, uncertain, doubtful) |
| division |
| indeterminate(adjective, clear, certain, uncertain, anxious) |