| earnest(significant, substantial, valuable, persistent) |
| extensive(significant, substantial, valuable, vital) |
| far-reaching(significant, substantial, valuable, vital) |
| front-page(significant, substantial, valuable, vital) |
| grave(adjective, severe, harsh, heavy) |
| large(significant, substantial, valuable, vital) |
| marked(significant, substantial, valuable, vital) |
| material(significant, substantial, valuable, vital) |
| mattering much(expression, significant, substantial, valuable) |
| meaningful(significant, substantial, valuable, vital) |
| momentous(adjective, heavy, significant, substantial) |
| of moment(expression, significant, substantial, valuable) |
| of note(expression, significant, substantial, valuable) |
| of substance(expression, significant, substantial, valuable) |
| paramount(adjective, significant, substantial, large) |
| ponderous(severe, harsh, heavy, substantial) |
| primary(significant, substantial, valuable, vital) |
| principal(adjective, significant, substantial, large) |
| relevant(significant, substantial, valuable, vital) |
| salient(significant, substantial, valuable, vital) |