| objectionable | Arousing disapproval; likely to cause offense or disapproval. | |
| obfuscated | To make something unclear or obscure, so that it is difficult to understand | |
| obdurate | Stubbornly refusing to change one's opinion or course of action | |
| nuance | A subtle difference in or shade of meaning, expression, or sound | |
| noxious | Harmful, poisonous, or very unpleasant | |
| novitiate | The period or state of being a novice, especially in a religious order. | |
| novel | A fictitious prose narrative of book length, typically representing character and action with some degree of realism | |
| notorious | Famous or well known, typically for some bad quality or deed | |
| nostrum | A medicine, especially one that is not considered effective, prepared by an unqualified person. | |
| nostalgia | A sentimental longing or wistful affection for a period in the past. | |