| imperative(adjective, firm, prompt, important) |
| urgent(adjective, hard, tough, firm, difficult) |
| pressing(adjective, hard, tough, firm, difficult) |
| instant(adjective, prompt, important, extreme) |
| crying(adjective, firm, prompt, important) |
| critical(adjective, hard, tough, difficult) |
| dire(adjective, firm, prompt, heavy) |
| importunate(adjective, hard, tough, firm, difficult) |
| weighty(adjective, hard, tough, difficult, harsh) |
| burning(adjective, firm, prompt, important) |
| crucial(adjective, heavy, important, significant) |
| serious(adjective, hard, tough, difficult) |
| emergent |
| vital(adjective, heavy, important, significant) |
| decisive(adjective, great, significant, substantial) |
| essential(adjective, important, significant, substantial) |
| heavy(adjective, difficult, harsh, heavy) |
| chief(adjective, significant, substantial, large) |
| considerable(significant, substantial, valuable, vital) |
| determining(significant, substantial, valuable, vital) |