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.

      1. Plosive.

         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