• adj. 努力的；硬的；困難的；辛苦的；確實的；嚴厲的；猛烈的；冷酷無情的
• adv. 努力地；困難地；辛苦地；接近地；猛烈地；牢固地
• n. (Hard)人名；(英、芬、瑞典)哈德

來自古英語heard,堅固的，堅硬的，固定的，來自PIE*ker,硬的，詞源同democracy,aristocracy.由堅硬的引申詞義頑強的，耐受的，環境艱苦的，困難的等多種詞義。可能來自PIE*sker,彎，轉，編織，詞源同cradle,crown.由編織引申詞義團結，堅固。

hard

hard: [OE] Hard comes ultimately from a prehistoric Indo-European *krátus, which denoted ‘power, strength’. This original meaning was carried over into Greek krátos ‘strength, power, authority’ (source of the ending -cracy in such English words as democracy and plutocracy), but the Germanic languages took it over mainly in the sense ‘resistant to physical pressure’.

The prehistoric Germanic form *kharthuz produced, besides English hard, German hart, Dutch hard, Swedish h?rd, and Danish haard. The sense ‘difficult’, incidentally, developed in the 14th and 15th century from the notion ‘resistant to one’s efforts’. A Germanic derived verb *kharthjan ‘harden’ was borrowed into Old French as hardir ‘embolden’, and its past participle hardi ‘bold’ reached English as hardy [13].

Its main modern sense, ‘robust, tough’, presumably a harking back to its distant English relative hard, developed in the 16th century.
=> hardy

hard (adj.)

Old English heard "solid and firm, not soft," also, "difficult to endure, carried on with great exertion," also, of persons, "severe, rigorous, harsh, cruel," from Proto-Germanic *hardu- (cognates: Old Saxon hard, Old Frisian herd, Dutch hard, Old Norse harer "hard," Old High German harto "extremely, very," German hart, Gothic hardus "hard"), from PIE *kortu- (cognates: Greek kratos "strength," kratys "strong"), suffixed form of root *kar-/*ker- "hard."

Meaning "difficult to do" is from c. 1200. Of water, in reference to the presence of mineral salts, 1650s; of consonants, 1775. Hard of hearing preserves obsolete Middle English sense of "having difficulty in doing something." In the sense "strong, spiritous, fermented" from 1789 (as in hard cider, etc.), and this use probably is the origin of that in hard drugs (1955). Hard facts is from 1853; hard news in journalism is from 1918. Hard copy (as opposed to computer record) is from 1964; hard disk is from 1978; the computer hard drive is from 1983. Hard times "period of poverty" is from 1705. Hard money (1706) is specie, as opposed to paper. Hence 19c. U.S. hard (n.) "one who advocates the use of metallic money as the national currency" (1844). To play hard to get is from 1945. Hard rock as a pop music style recorded from 1967. To do something the hard way is from 1907.

hard (adv.)

Old English hearde "firmly, severely," from hard (adj.). Meaning "with effort or energy, with difficulty" is late 14c.

1. When life gets hard and you want to give up, remember that life is full of ups and downs, and without the downs, the ups would mean nothing.

當生活很艱難，你想要放棄的時候，請記住，生活充滿了起起落落，如果沒有低谷，那站在高處也失去了意義。

來自

2. Talent, hard work and sheer tenacity are all crucial to career success.

事業要成功，才能、勤奮和頑強的意志都至關重要。

來自柯林斯例句

3. The federal government hiked the tax on hard liquor.

聯邦政府提高了烈性酒的稅率。

來自柯林斯例句

4. People are having to think hard about their holiday plans.

人們現在得仔細地琢磨自己的度假計劃。

來自柯林斯例句

5. Many parents find it hard to discourage bad behaviour.

很多父母覺得要孩子循規蹈矩是件很難的事情。

來自柯林斯例句