| A | B |
| nettle | to irritate, annoy, or provoke |
| obdurate (OB against + DURUS Latin for "hard") | hard-hearted; stubbornly wicked; harsh |
| obfuscate (OB towards + FUSCUS Latin for "dark") | to make confused; to muddle; to darken; to make obscure or hard to understand |
| obstreperous (OB towards + STREPERE Latin for "rattle") | noisy; unruly; resisting control |
| obtrusive (OB against + TRUDE) | undesirably noticeable; thrusting out; something pushed on another person without their will or consent |
| obviate (OB against + VIA road + -ATE cause) | to anticipate and prevent or eliminate |
| odious (think foul odor) | hateful; detestable; disgusting |
| olfactory | having to do with the sense of smell |
| ominous (think omen) | threatening; menacing; a portent of evil or trouble |
| opalescence (think the color opal) | the reflection of a milky or pearly white |
| opprobrium (OP/OB towards + PROBRUM Latin for disgrace) | disgrace arising from extremely shameful conduct |
| opulent (OPER work + -OUS full of) | wealthy, rich, or affluent; exhibiting great wealth |
| ostentatious | showing off; wanting others to see |
| ostracize (think OSTRICH + -IZE make; ostriches put there head in the ground) | to exclude, by general consent, from a group, society, friendship, organization, etc.; to banish |
| overture (O/OB towards + VERT turn) | an opening or initiating move toward negotiations, a new relationship, an agreement, etc.; |
| pall | to become distasteful or unpleasant |
| paragon (PARA near or beside) | a model of excellence (when compared, or placed beside, others) |
| pariah | an outcast; a person generally despised or avoided |
| parlance (PARL speak) | conversation |
| parsimonious (PART + MON warn) | cheap; stingy with money (think someone who is afraid to part with money) |
| pecuniary | of or pertaining to money |
| pellucid (PEL/PER through + LUC light) | clear in expression, meaning, or style; allowing much light to pass through |
| penurious (think pennies) | unwilling to spend money; cheap or stingy; poverty-stricken |
| peremptory (think empty) | not allowing contradiction or refusal |
| perfunctory (PER through + FUNCTION; think functional, but not exceptional) | lacking interest, care, or enthusiasm; approaching as only a routine duty |