| hard | (adjective) produced without vibration of the vocal cords | Synonyms: surd, unvoiced, voiceless |
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| (adjective) resisting weight or pressure | - |
| (adjective) dispassionate | - |
| (adjective) (of speech sounds); produced with the back of the tongue raised toward or touching the velum | - |
| (adjective) (of light) transmitted directly from a pointed light source | Synonyms: concentrated |
| (adjective) not easy; requiring great physical or mental effort to accomplish or comprehend or endure | Synonyms: difficult |
| (adjective) being distilled rather than fermented; having a high alcoholic content | Synonyms: strong |
| (adjective) unfortunate or hard to bear | Synonyms: tough |
| (adjective) given to excessive indulgence of bodily appetites especially for intoxicating liquors | Synonyms: heavy, intemperate |
| (adjective) dried out | - |
| (adjective) very strong or vigorous | Synonyms: knockout, severe |
| (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, heavy, laborious, operose, punishing, toilsome |
| hardback | (adjective) having a hard back or cover | Synonyms: hardbacked, hardbound, hardcover |
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| hardbacked | (adjective) having a hard back or cover | Synonyms: hardback, hardbound, hardcover |
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| hardbound | (adjective) having a hard back or cover | Synonyms: hardback, hardbacked, hardcover |
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| hardcore | (adjective) extremely explicit | Synonyms: hard-core |
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| (adjective) intensely loyal | Synonyms: hard-core |
| hardcover | (adjective) having a hard back or cover | Synonyms: hardback, hardbacked, hardbound |
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| hardened | (adjective) made hard or flexible or resilient especially by heat treatment | Synonyms: tempered, toughened, treated |
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| (adjective) protected against attack (especially by nuclear weapons) | - |
| (adjective) made tough by habitual exposure | Synonyms: enured, inured |
| (adjective) converted to solid form (as concrete) | Synonyms: set |
| (adjective) used of persons; emotionally hardened | Synonyms: case-hardened, hard-boiled |
| hardfisted | (adjective) unwilling to part with money | Synonyms: closefisted, tightfisted |
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| hardheaded | (adjective) guided by practical experience and observation rather than theory | Synonyms: hard-nosed, practical, pragmatic |
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| (adjective) unreasonably rigid in the face of argument or entreaty or attack | Synonyms: mulish |
| hardhearted | (adjective) lacking in feeling or pity or warmth | Synonyms: heartless |
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| (adjective) devoid of feeling for others | Synonyms: stonyhearted, unfeeling |
| hardline | (adjective) firm and uncompromising | Synonyms: hard-line |
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| hardscrabble | (adjective) barely satisfying a lower standard | - |
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| hardworking | (adjective) characterized by hard work and perseverance | Synonyms: industrious, tireless, untiring |
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| hardy | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, intrepid, unfearing |
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| (adjective) having rugged physical strength; inured to fatigue or hardships | Synonyms: stalwart, stout, sturdy |
| (adjective) able to survive under unfavorable weather conditions | - |