- intervene: occur between other event or between certain points of time
- intimidate: make timid or fearful, frightened
- intractable: unruly; difficult to manage;
- intransigence: refusal of any compromise
- intrepid: courageous; fearless
- intricate: Difficult to follow or understand.
- intrinsic: Inherent, natural
- introspective: examining of one's own thoughts and feelings
- intuition: instinctive knowing (without the use of rational processes)
- inundate: overwhelm; flood; submerge