| A | B |
| inclement | stormy, severe |
| incongruity | not conforming, disagreeing, not compatible |
| incurious | uninterested, lacking normal curiosity |
| indefatigable | tireless, incapable of being fatigued |
| inextricable | not able to be disentangled |
| infamous | having a reputation of the worst kind, disgraceful, vicious, notoriously bad |
| inopportune | inconvenient, poorly timed |
| inscrutable | difficult to understand; mysterious |
| insidious | treacherous or dangerous in a secret sort of way |
| inveterate | firmly established, habitual, deep-rooted |
| inviolable | secure from violation or from being profaned |
| jocular | jesting or joking |
| jollity | merriment, state of being jolly |
| labyrinthine | like a maze, very convoluted and intricate |
| lament | mourn or express sorrow in a demonstrative manner - such as wailing |
| languid | slow, sluggish, listless, weak |
| laud | to praise, to extol |
| loquacious | very talkative |
| lurid | sensationalism that is gruesome and causes shock or horror |
| magnate | person of power and influence |
| malefactor | criminal |
| malevolence | wishing ill will or evil on someone |
| malicious | activity motivated by hate or deliberate intent to harm |
| malleable | capable of being shaped, influenced, or altered; tractable |
| melancholy | depression of spirits, sad |