| A | B |
| invective | abusive language |
| invidious | causing resentment |
| irascible | irritable, easily provoked |
| jaded | wearied by too much of a good life |
| jingoism | extreme patriotism |
| jocose | merry, jolly, and playful |
| jocular | joking |
| jocund | cheerful |
| ken | understanding |
| kiosk | small booth where items are bought |
| kismet | fate or fortune |
| knave | a clever bad guy |
| knavery | mischief or trickery |
| kleptomaniac | a compulsive stealer |
| Labyrinth | a compulsive stealer |
| lacerate | to rip, tear, or cut |
| lackadaisical | lacking in spirit or liveliness |
| laconic | using few words; concise |
| lambaste | to thrash or beat; to scold |
| languid | lacking energy; lackadaisical; weak or slow |
| languish | to lose strength; to waste away |
| languor | the state of being languid; sluggishness |
| larceny | stealing |
| lascivious | lustful; lewd |
| lassitude | a state of exhaustion or weakness |
| latent | potential but not yet displayed |
| laud | to praise |
| laudatory | praising |
| lecherous | lustful; lewd |