| A | B |
|---|
| obdurate | unyielding to persuasion or moral influences |
| obfuscate | to render incomprehensible |
| oblique | diverging from a straight line or course, not straightforward |
| obsequious | excessively compliant or submissive |
| obstreperous | noisy, unruly |
| obtuse | lacking quickness of sensibility or intellect |
| odious | instilling hatred or intense displeasure |
| officious | offering one's services when they are neither wanted nor needed |
| opulent | characterized by rich abundance verging on ostentation |
| ostensible | appearing as such, seemingly |
