| matter of course(noun, expression, idiom, form, characteristic) |
| mess(noun, worry, difficulty, distress, anxiety) |
| millstone(noun, difficulty, obstacle, obstruction, impediment) |
| mode(noun, form, characteristic, rule, thing) |
| monkey(noun, force, passion, desire, thing) |
| monkey wrench(noun, expression, difficulty, restraint, hindrance) |
| moratorium |
| muddle(noun, difficulty, mess, hardship, jam) |
| necessity(noun, force, restraint, pressure, spring) |
| no-no(control, force, check, limit, condition) |
| objection |
| observance(noun, form, characteristic, rule, thing) |
| on the brain(noun, expression, idiom, love, passion) |
| one-track mind(noun, expression, passion, desire, thing) |
| pain in the neck(expression, idiom, trouble, difficulty, stress) |
| partiality(noun, love, passion, desire, thing) |
| pass(noun, difficulty, mess, hardship, jam) |
| pause |
| perplexity(noun, fix, difficulty, uncertainty, mess) |
| pet peeve(expression, trouble, difficulty, stress, annoyance) |