| lovelorn | Being unhappy because of unrequited love or an ended love affair | |
| loquacious | Tending to talk a great deal; talkative | |
| logorrhea | A tendency to extreme loquacity, producing incoherent talk | |
| listless | Lacking energy or enthusiasm | |
| lionized | To give a lot of public attention and approval to someone; treat as a celebrity | |
| levity | lightness of mind, character, or behavior; lack of appropriate seriousness or earnestness | |
| legerdemain | Skillful use of one's hands when performing conjuring tricks | |
| lax | Not sufficiently strict, severe, or careful | |
| laudable | Deserving praise and commendation | |
| latent | Existing but not yet developed or manifest; hidden or concealed | |