| Term | Definition |
| toxic | poisonous |
| tractable | docile; willing |
| traduce | expose to slander |
| tranquility | calmness; peace |
| transcend | exceed; surpass |
| transgression | violation of a law; sin |
| transient | quickly passing away; staying for a short time |
| translucent | partly transparent |
| traverse | go through or across |
| travesty | comical parody; treatment aimed at making something appear ridiculous |
| treatise | article treating a subject systematically and thoroughly |
| tremulous | trembling |
| trenchant | cutting; keen |
| trepidation | fear; trembling agitation |