| heavy(adjective, tough, severe, informal) |
| principal(adjective, great, significant, substantial) |
| salient(adjective, significant, substantial, valuable) |
| decisive(adjective, severe, important, significant) |
| emergent |
| substantial(adjective, significant, valuable, vital) |
| considerable(significant, substantial, valuable, vital) |
| determining(important, significant, substantial, serious) |
| extensive(significant, substantial, valuable, vital) |
| far-reaching(severe, significant, substantial, valuable) |
| front-page(significant, substantial, valuable, vital) |
| great(adjective, firm, intense, passionate) |
| large(significant, substantial, valuable, vital) |
| marked(significant, substantial, valuable, vital) |
| material(adjective, significant, substantial, valuable) |
| mattering much(expression, significant, substantial, valuable) |
| of moment(expression, significant, substantial, valuable) |
| of note(expression, significant, substantial, valuable) |
| of substance(expression, significant, substantial, valuable) |
| ponderous(significant, substantial, valuable, vital) |