What is the meaning of Hard?

Solid and firm.

1. Resistant to pressure; difficult to break, cut, or penetrate.

   Resistant to pressure; difficult to break, cut, or penetrate.

   Strong.

   Containing alcohol.

   Very acidic or tannic.

   High in dissolved chemical salts, especially those of calcium.

   Having the capability of being a permanent magnet by being a material with high magnetic coercivity (compare soft).

   Having a high energy (high frequency; short wavelength).

   Made up of parallel rays, producing clearly defined shadows.

   Having a severe property; presenting difficulty.

   1. Difficult or requiring a lot of effort to do, understand, experience, or deal with.

      Difficult or requiring a lot of effort to do, understand, experience, or deal with.

      Demanding a lot of effort to endure.

      Severe, harsh, unfriendly, brutal.

      Difficult to resist or control; powerful.

      Hardened; having unusually strong defences.

      Tough, muscular, badass.

      Excellent, impressive.

      Unquestionable; unequivocal.

      Having a comparatively larger or a ninety-degree angle.

      Sexually aroused; having an erect penis.

      Having muscles that are tightened as a result of intense, regular exercise.

      Fortis.

      Plosive.

      Unvoiced.

      Velarized or plain, rather than palatalized.

      Having a severe property; presenting a barrier to enjoyment.

      1. Rigid in the drawing or distribution of the figures; formal; lacking grace of composition.
      2. Having disagreeable and abrupt contrasts in colour or shading.

      Rigid in the drawing or distribution of the figures; formal; lacking grace of composition.

      Having disagreeable and abrupt contrasts in colour or shading.

      1. In a physical form, not digital.

         In a physical form, not digital.

         Using a manual or physical process, not by means of a software command.

         Far, extreme.

         Of silk: not having had the natural gum boiled off.

         Of a market: having more demand than supply; being a seller's market.

         Hardcore.

         With much force or effort.

         With difficulty.

         So as to raise difficulties.

         Compactly.

         Near, close.

         A firm or paved beach or slope convenient for hauling vessels out of the water.

         A tyre whose compound is softer than superhards, and harder than mediums.

         Crack cocaine.

         Hard labor.

         To make hard, harden.

         hard, strong

         strong, not easily devalued

         unquestionable, uncontestable

         heartless, unsympathetic (of a person)

         hard, difficult

         harsh, heavy

         hard, rich in calcium (of water)

         loud (of sound)

         fast

         fast, swiftly

         very

         loudly

         inflection of harden:

         1. first-person singular present indicative
         2. (in case of inversion) second-person singular present indicative
         3. imperative

         first-person singular present indicative

         (in case of inversion) second-person singular present indicative

         imperative

         hardcore

         hardcore pornography

         hard rock

         h-prothesized form of ard

         hard

         hard (not soft)

         hard, stern, severe

         hardy

         hard

         hard, stern, severe

         hardy

         hard

         hard

         hard, heavy, hardcore

         Source: wiktionary.org