| leading(adjective, characteristic, importance, principle) |
| main(adjective, characteristic, importance, principle) |
| necessary(adjective, characteristic, importance, principle) |
| necessitous(adjective, characteristic, importance, principle) |
| needed(adjective, characteristic, importance, principle) |
| needful(adjective, characteristic, importance, principle) |
| opportune(adjective, characteristic, usefulness, favour) |
| prerequisite(adjective, characteristic, importance, principle) |
| principal(adjective, characteristic, importance, principle) |
| proper(adjective, characteristic, usefulness, favour) |
| ready(adjective, characteristic, usefulness, favour) |
| required(adjective, characteristic, importance, principle) |
| requisite(adjective, characteristic, importance, principle) |
| right-hand(adjective, characteristic, importance, principle) |
| roomy(adjective, characteristic, usefulness, favour) |
| seasonable(adjective, characteristic, usefulness, favour) |
| serviceable(adjective, characteristic, usefulness, favour) |
| suitable(adjective, characteristic, usefulness, favour) |
| suited(adjective, characteristic, usefulness, favour) |
| time-saving(adjective, characteristic, usefulness, favour) |