| grave(adjective, calm, dull, quiet, help) |
| severe(adjective, calm, help, bad, strong) |
| weighty(adjective, good, dull, hard, great) |
| solemn(adjective, calm, dull, quiet, cool) |
| important(adjective, good, great, severe, extraordinary) |
| earnest(noun, adjective, calm, dull, work) |
| critical(adjective, hard, great, tough, severe) |
| significant(adjective, good, great, extraordinary, importance) |
| sad(adjective, hard, difficult, complex, importance) |
| sober(adjective, calm, dull, quiet, cool) |
| difficult(adjective, hard, tough, easy, harsh) |
| grievous(adjective, help, hard, great, tough) |
| momentous(adjective, good, great, severe, extraordinary) |
| consequential(adjective, good, harsh, importance, big) |
| tough(adjective, bad, strong, hard, easy) |
| ambitious(adjective, hard, difficult, importance, complex) |
| hard(adjective, strong, tough, easy, severe) |
| profound(adjective, hard, difficult, complex, deep) |
| arduous(adjective, hard, tough, easy, difficult) |
| nasty(adjective, bad, hard, difficult, offensive) |