| serious(adjective, characteristic, calm, dull, quiet) |
| severe(adjective, calm, quiet, help, hard) |
| weighty(adjective, dull, hard, great, tough) |
| solemn(adjective, characteristic, calm, dull, quiet) |
| grievous(adjective, help, bad, hard, great) |
| sad(adjective, hard, difficult, complex, gloomy) |
| important(adjective, great, tough, severe, importance) |
| sober(adjective, characteristic, calm, dull, quiet) |
| earnest(adjective, characteristic, calm, dull, quiet) |
| dire(adjective, hard, difficult, complex, warn) |
| momentous(adjective, importance, important, valuable, main) |
| critical(adjective, great, heavy, property, important) |
| hard(adjective, tough, severe, difficult, harsh) |
| ponderous(adjective, hard, difficult, gloomy, complex) |
| sedate(adjective, characteristic, calm, dull, quiet) |
| nasty(adjective, hard, difficult, unpleasant, complex) |
| cruel(adjective, hard, difficult, pain, complex) |
| difficult(adjective, hard, tough, severe, harsh) |
| heavy(adjective, bad, severe, difficult, sad) |
| painful(adjective, hard, difficult, complex) |