| toilsomeness |
| activity(noun, care, vigor, intensity, application) |
| adversity(noun, trouble, difficulty, pain, struggle) |
| alertness(noun, activity, care, vigor, intensity) |
| ardor |
| ardour |
| attention(noun, activity, care, vigor, intensity) |
| attentiveness(noun, activity, care, vigor, intensity) |
| awkwardness(noun, trouble, difficulty, pain, struggle) |
| barricade(noun, trouble, difficulty, pain, struggle) |
| briskness(noun, activity, care, vigor, intensity) |
| care(noun, activity, vigor, intensity, application) |
| carefulness(noun, activity, care, vigor, intensity) |
| check(noun, trouble, difficulty, pain, struggle) |
| concentration |
| constancy(noun, activity, care, vigor, intensity) |
| crisis(noun, trouble, difficulty, pain, struggle) |
| crux(noun, trouble, difficulty, pain, struggle) |
| dead end(noun, expression, trouble, difficulty, pain) |
| deadlock(noun, trouble, difficulty, pain, struggle) |