| Term | Definition |
| Hackneyed | overused; trite; stale |
| hapless | unlucky |
| harbinger | forerunner; a signal of |
| hedonism | the pursuit of pleasure as a way of life |
| hegemony | leadership, especially of one nation over another |
| heresyany | belief that is strongly opposed to established beliefs |
| hermetic | impervious to external influence; airtight |
| heyday | golden age; prime |
| hiatus | a break or interruption, often from work |
| hierarchy | an organization based on rank or degree; pecking order |
| homily | a sermon |
| homogeneous | uniform; made entirely of one thing |
| husbandry | thrifty management of resources; livestock farming |
| hyperbole | an exaggeration used as a figure of speech; exaggeration |
| hypothetical | uncertain; unproven |
| iconoclast | one who attacks popular beliefs or institutions |
| ideology | a system of social or political ideas |
| idiosyncracy | a peculiarity; an eccentricity |
| idyllic | charming in a rustic way; naturally peaceful |
| ignominy | deep disgrace |
| illicit | illegal; not permitted |
| immigrate | to move permanently to a new country |
| imminent | just about to happen |
| immutable | unchangeable |
| impartial | fair; not favoring one side or the other; unbiased |
| impeccable | flawless; entirely without sin |
| imperial | like an emperor or an empire |
| H(om) | same |
| hyper | over, excessive |
| hypo | under, beneath, less than |
| id | one's own |
| im/in | not, without |
| im/in/em/en | in, into |