| imperative(adjective, firm, prompt, big, important) |
| urgent(adjective, hard, tough, firm, difficult) |
| exacting(adjective, difficult, harsh, heavy, serious) |
| pressing(adjective, hard, tough, firm, difficult) |
| demanding(adjective, hard, tough, firm, difficult) |
| instant(adjective, prompt, big, important, extreme) |
| insistent(adjective, hard, tough, firm, difficult) |
| clamant(adjective, firm, prompt, important, fast) |
| necessary(adjective, important, substantial, serious, valuable) |
| onerous(adjective, difficult, harsh, heavy, demanding) |
| crying(adjective, firm, prompt, big, important) |
| rigorous(adjective, difficult, heavy, severity, taxing) |
| strict(adjective, difficult, severity, taxing) |
| critical(adjective, hard, tough, difficult, big) |
| oppressive(adjective, hard, difficult, heavy, severity) |
| severe(adjective, hard, tough, difficult, harsh) |
| burdensome(adjective, difficult, heavy, troublesome, taxing) |
| dire(adjective, firm, prompt, big, heavy) |
| importunate(adjective, hard, tough, firm, difficult) |
| clamorous(adjective, hard, tough, firm, difficult) |