| urgent(adjective, hard, tough, continue, firm) |
| pressing(adjective, hard, tough, firm, difficult) |
| exigent(adjective, hard, tough, firm, difficult) |
| earnest(adjective, significant, substantial, valuable) |
| imperative(adjective, firm, prompt, important) |
| necessary(important, significant, substantial, serious) |
| chief(significant, substantial, valuable, vital) |
| considerable(significant, substantial, valuable, vital) |
| critical(adjective, hard, tough, difficult) |
| crucial(adjective, important, significant, substantial) |
| decisive(significant, substantial, valuable, vital) |
| determining(significant, substantial, valuable, vital) |
| essential(adjective, important, significant, substantial) |
| extensive(significant, substantial, valuable, vital) |
| far-reaching(significant, substantial, valuable, vital) |
| front-page(significant, substantial, valuable, vital) |
| heavy(significant, substantial, valuable, vital) |
| large(significant, substantial, valuable, vital) |
| marked(significant, substantial, valuable, vital) |
| material(significant, substantial, valuable, vital) |