| controversy(noun, activity, trouble, bother, excitement) |
| demur(noun, issue, dislike, challenge, doubt) |
| dispute(noun, activity, break, trouble, bother) |
| enigma(noun, trouble, challenge, question, secret) |
| grief(noun, trouble, ruin, worry, blow) |
| handicap(noun, trouble, disorder, weakness, bar) |
| hardness(noun, discipline, severity, harshness, toughness) |
| involvement(noun, trouble, disorder, confusion, struggle) |
| mystery(noun, trouble, issue, challenge, question) |
| quarrel(noun, activity, action, trouble, bother) |
| spot(noun, trouble, place, fix, worry) |
| straits(noun, trouble, pass, distress, failure) |
| weight(noun, trouble, force, charge, worry) |
| difficulties |
| abstruseness(noun, question, secret, puzzle, subtlety) |
| aggravation(noun, upset, trouble, bother, worry) |
| altercation(noun, activity, trouble, bother, excitement) |
| anxiety(noun, trouble, worry, concern, strain) |
| bar(noun, trouble, disorder, block, weakness) |
| barrier(noun, disorder, block, weakness, restraint) |