| inexorable(adjective, cruel, obvious, pitiless, necessity) |
| unavoidable(adjective, certain, significant, near, essential) |
| compulsive |
| incumbent |
| must(adjective, required) |
| bounden(necessary, required, obligatory, conclusive) |
| coactive(restraint, compulsion) |
| exigent(adjective, important, significant, essential, critical) |
| needed(adjective, set, significant, essential, basic) |
| obligation |
| peremptory(affected, compulsion, strained, commanding, unnatural) |
| urgent(adjective, important, significant, essential, critical) |
| compulsatory(adjective, compulsion, commanding, required, authoritative) |
| basic(adjective, significant, essential, vital, fundamental) |
| crucial(adjective, important, significant, essential, critical) |
| de rigueur(expression, adjective, idiom, significant, essential) |
| demanded |
| forcible(adjective, powerful, aggressive) |
| imposed |
| irresistible(expected, necessity, predictable, necessary, inexorable) |