| difficulty(noun, difficulty, situation, discipline, problem) |
| hardness(noun, difficulty, discipline, toughness, strictness) |
| strenuousness(noun, trouble, difficulty, pain, struggle) |
| toughness(noun, difficulty, discipline, strictness, hardness) |
| complexity(noun, difficulty, adversity, complication, intricacy) |
| complication(noun, trouble, difficulty, pain, struggle) |
| severity(noun, difficulty, discipline, strictness, painfulness) |
| harshness(noun, difficulty, discipline, strictness) |
| laboriousness(noun, trouble, difficulty, pain, struggle) |
| painfulness(noun, trouble, difficulty, pain, struggle) |
| adversity(noun, trouble, difficulty, pain, struggle) |
| hardship(noun, trouble, difficulty, pain, struggle) |
| intricacy(noun, adversity, complication, complexity, complicatedness) |
| onerousness(noun, difficulty, laboriousness, strenuousness) |
| oppressiveness(noun, difficulty, painfulness) |
| rigor(discipline, strictness) |
| roughness(noun, difficulty) |
| trickiness(noun, difficulty, adversity, complication, complexity) |
| trouble(noun, difficulty, pain, struggle, obstacle) |
| wearying(noun, difficulty) |