| Term | Definition |
| inherent | firmly est. by nature or habit |
| insensible | unconscious |
| insipid | lack flavor; dull |
| insularity | narrow-minded; isolation |
| intractable | unruly; stubborn |
| intransigence | refusal of any compromise |
| inundate | overwhelm |
| inured | accustomed |
| invective | abuse |
| irascile | irritable |
| irresolute | uncertain how to act; weak |
| laconic | brief and to the point |
| lassitude | weariness; languor |
| latent | potential but undevloped |
| laud | praise |
| levity | lack of seriousness |
| loquacious | talkative |
| lucid | easy to understand |
| magnanimity | generously |
| malingere | fakes illness to escape duty |
| malleable | capable of being shaped; impressionable |
| maverick | rebel |
| mendacious | lying |
| misanthrope | one who hates mankind |
| mitigate | moderate |
| mollify | soothe |
| morose | sullen |
| neophyte | recent convert; beginner |
| obdurate | stubborn |
| obsequious | slavishly attentive |
| obviate | make unecessary |
| occlude | shut; close |
| officious | meddlesome |
| onerous | burdensome |
| opprobrium | infamy; villification |
| partisan | one-sided; commited to a party |
| pathological | pertaining to disease |
| paucity | scarcity |
| pedantic | showing off learning; bookish |
| penury | severe poverty |
| perennial | long-lasting |
| perfidious | treacherous; disloyal |
| perfunctory | superficial |
| permeable | porous; allow liquids/gas to pass through |
| phlegmatic | calm |