| merciless(adjective, tough, rough, difficult, heavy) |
| misery(noun, trouble, worry, difficulty, lack) |
| murder(adjective, tough, rough, difficult, heavy) |
| onerous(adjective, tough, rough, difficult, heavy) |
| operose(adjective, tough, rough, difficult, heavy) |
| oppression(noun, trouble, worry, difficulty, lack) |
| peril(noun, trouble, worry, difficulty, lack) |
| persecution(noun, trouble, worry, difficulty, lack) |
| personal burden(noun, expression, trouble, worry, torment) |
| rainy day(noun, expression, trouble, worry, torment) |
| rigorous(adjective, tough, rough, difficult, heavy) |
| rotten luck(noun, expression, trouble, worry, difficulty) |
| rough(adjective, tough, difficult, heavy, awkward) |
| rugged(adjective, tough, rough, difficult, heavy) |
| scabrous(adjective, tough, rough, difficult, heavy) |
| serious(adjective, tough, rough, difficult, heavy) |
| severe(adjective, tough, rough, difficult, heavy) |
| slavish(adjective, tough, rough, difficult, heavy) |
| sticky(adjective, tough, rough, difficult, heavy) |
| strenuous(adjective, tough, rough, difficult, heavy) |