| Words | Synonyms | Antonyms |
| Haphazard | indiscriminate, unplanned, random, arbitrary, casual, incidental | systematic, organized, planned |
| Harass | beset, hound, annoy, plague, pester, torment | aid, facilities, support |
| Hardship | asperity, difficulty, adversity, affliction, catastrophe, distress | benefit, assistance, ease |
| Harmony | accord, agreement, conformity, congruence, rapport, symmetry | disagreement, discord, clash |
| Harsh | coarse, jagged, rugged, hoarse, jarring, acerbic | mild, pleasing, soft |
| Hateful | malicious, malevolent, malignant, nasty, spiteful, vicious | amiable, harmless, loving |
| Hazardous | dangerous, jeopardous, perilous, treacherous, chancy, risky | guarded, safe, secure |
| Hoax | con, deceit, fake, fraud, gimmick, prank | frankness, openness, uprightness |
| Homely | plain, unattractive, uncomely, simple, ordinary, comfortable | attractive, modern, charming |
| Homogenous | akin, alike, analogous, identical, uniform, similar | heterogeneous, varied, discrete |
| Horrific | horrible, horrid, terrible, awful, dreadful, beastly | comforting, reassuring, satisfying |
| Hostile | belligerent, combative, contentious, pugnacious | agreeable, friendly, gentle |
| Humorous | amusing, comic, jocular, witty, facetious, funny | morose, sad, tragic |
| Hurdle | bar, barrier, block, clog, hamper, impediment | furtherance, assistance, help |