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English definition of “hard”

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hard

adjective uk   /hɑːd/ us    /hɑːrd/

hard adjective (SOLID)

A2 not easy to bend, cut, or break: a hard surface There was a heavy frost last night and the ground is still hard. Heating the clay makes it hard.
Opposite
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hard adjective (DIFFICULT)

A1 difficult to understand, do, experience, or deal with: There were some really hard questions in the exam. It's hard to say which of them is lying. It's hard being a single mother. Her handwriting is very hard to read. He's a hard man to please. The topics get harder later in the course. I feel sorry for the kids, too - they've had a hard time.
Opposite
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hard adjective (USING EFFORT)

B1 needing or using a lot of physical or mental effort: Go on - give it a good hard push! It was hard work on the farm but satisfying.
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hard adjective (SEVERE)

B2 not pleasant or gentle; severe: You have to be quite hard to succeed in the property business. Ooh, you're a hard woman, Elaine! Our boss has been giving us all a hard time at work (= making our time at work difficult).be hard on sb B2 to criticize someone severely, or to treat someone unfairly: Don't be too hard on him - he's new to the job.
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hard adjective (ALCOHOL)

[before noun] A hard drink contains a high level of alcohol: hard liquor

hard adjective (WATER)

Hard water contains a high level of minerals that prevent soap from cleaning.

hard adjective (CLEAR)

hard adjective (WEATHER)

used to describe a time when there is bad weather: We had a very hard winter last year.
hardness
noun [U] uk   /-nəs/ us  
These alloys are characterized by their extreme hardness.

hard

adverb uk   /hɑːd/ us    /hɑːrd/

hard adverb (USING EFFORT)

A1 with a lot of physical or mental effort: Work hard and play hard, that's my motto. I'm not surprised he failed his exam - he didn't exactly try very hard!
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hard adverb (WEATHER)

B1 If it rains or snows hard, it rains or snows a lot: It had been raining hard most of the afternoon.
(Definition of hard from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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