| Term | Definition |
| furtive | secret, done quickly to avoid notice |
| galvanize | to arouse, to stimulate, to startle |
| garner | to gather, collect |
| garrulous | talkative |
| gratuitous | unececessary, uncalled for |
| guile | cunning, trickery, deceit |
| heretic | someone whose beliefs go against those of his religious |
| hieracrchy | ordering by class, grade, status, or rank |
| homogeneous | similar, all alike, uniform |
| hyperbole | obvious exaggeration |
| hypothetical | supposed, unproven, theoretical |
| immaterial | irrelevant, unimportant |
| imminent | about to happen |
| immutable | unchanging, constant, inflexible |
| impertubable | calm cool, not easy to excite |
| implausible | unbelievable, incredible, seemingly untrue |
| inadvertent | unintentional, careless |
| incipient | beginning, at an early stage |
| incisive | direct, clear-cut, biting, cutting to the hear of the matter |
| incorrigible | uncorrectable, delinquent, uncontrollable, unable to be reformed |
| indigent | impoverished, poor |
| innocuous | harmless |
| insatiable | hard or impossible to satisfy |
| insurgent | a rebel, someone who revolts |
| intractable | stubborn, hard to manage |