| Term | Definition |
| habitat | dwelling place |
| hackneyed | worn out by over-use |
| hail | to greet with praise |
| hallow | to make holy; treat as sacred |
| hamlet | small village |
| hapless | unfortunate, having bad luck |
| harangue | a pompous speech |
| harbinger | precursor, sign of something to come |
| hardy | sturdy; robust; able to stand inclement weather |
| harmony | accord, agreement |
| harrowing | extremely distressing, terrifying |
| hasten | to hurry |
| haughty | arrogant and condescending |
| headlong | recklessly |
| headstrong | reckless, insisting on one's own way |
| heathen | pagan; uncivilized and irreligious |
| hectic | hasty, hurried |
| hector | a bully, braggart |
| hedonism | pursuit of pleasure as a goal |
| hegemony | leadership, domination, usually by a country |
| heinous | shocking, wicked, terrible |
| hemicycle | semicircular form or structure |
| hemorrhage | heavy bleeding, to bleed heavily |
| heretical | opposed to an established religious orthodoxy |
| hermetic | tightly sealed |
| heterodox | unorthodox, not widely accepted |
| heterogeneous | composed of unlike parts |
| hew | to cut with an axe |
| hiatus | a gap or break |
| hidebound | excessively rigid; dry and stiff |
| hinder | to hamper; obstruct |
| hindsight | understanding the nature of events after they happen |
| hinterland | wilderness |
| hoary | very old; whitish or gray from age |
| holistic | emphasizing importance of the whole and interdependence of its parts |
| holocaust | widespread destruction, usually by fire |
| homage | public honor and respect |
| homogeneous | composed of identical parts |
| homonym | word identical in pronunciation but different in meaning |
| hone | to sharpen |
| humane | merciful, kindly |
| husband | to farm; manage carefully and thriftily |
| hutch | pen or coop for animals |
| hygienic | clean, sanitary |
| hymn | religious song |
| hyperbole | purposeful exaggeration for effect |
| hyperventilate | to breathe abnormally fast |
| hypochondria | A psychological disorder characterized by the illusory conviction that one is ill or in pain, or likely to become so |
| hypocrite | person claiming beliefs or virtues he or she doesn't really possess |
| hypothermia | abnormally low body temperature |
| hypothesis | assumption subject to proof |
| hypothetical | theoretical, speculative; supposed or assumed true, but unproven |