| important(adjective, great, severe, importance, heavy) |
| essential(adjective, body, severe, importance, material) |
| critical(adjective, great, severe, big, heavy) |
| crucial(adjective, great, severe, big, heavy) |
| key(adjective, importance, important, significant, original) |
| necessary(adjective, body, material, big, important) |
| organic(adjective, important, active, significant, natural) |
| indispensable(adjective, important, significant, original, serious) |
| energetic(adjective, good, clear, strong, tough) |
| lively(adjective, good, clear, strong, tough) |
| vigorous(adjective, good, clear, strong, sound) |
| momentous(adjective, severe, importance, big, heavy) |
| urgent(adjective, severe, big, heavy, important) |
| serious(adjective, great, severe, importance, big) |
| fundamental(adjective, body, material, important, significant) |
| requisite(adjective, important, significant, original, essential) |
| basic(adjective, body, material, important, significant) |
| grave(adjective, importance, valuable, main, notable) |
| imperative(adjective, big, important, significant, substantial) |
| material(noun, adjective, importance, important, valuable) |