| Term | Definition |
| idolatry | idol worship |
| igneous | produced by fire; volcanic |
| imbroglio | complicated situation; an entanglement |
| immutable | unchangeable |
| impair | to damage; injure |
| impassive | showing no emotion |
| impecunious | poor; having no money |
| hyperbole | purposeful exaggeration for effect |
| harrowing | extremely distressing |
| hermetic | tightly sealed; magical |
| heterodox | unorthodox; not widely accepted |
| hirsute | covered with hair |
| histrionic | relating to exaggerated emotional behavior calculated for effect |
| homily | sermon; tedious moralizing lecture |
| grandiloquent | pompous; bombastic |
| gregarious | sociable |
| grouse | to complain |
| guileless | free of cunning or deceit; artless |
| gustatory | affecting the sense of taste |
| halcyon | calm and peaceful; happy; golden; prosperous |