Antonym: soften. Similar words: garden, warden, ardent, gardener, ardently, gardening, herb garden, hard-earned. Meaning: ['hɑrdn /'hɑː-] 
v. 1. become hard or harder 2. make hard or harder 3. harden by reheating and cooling in oil 4. make fit 5. cause to accept or become hardened to; habituate.
v. 1. become hard or harder 2. make hard or harder 3. harden by reheating and cooling in oil 4. make fit 5. cause to accept or become hardened to; habituate. 
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(91) In addition, you can personalize to harden in the packaging.
(92) Whilst Marc did gradually harden himself to the poverty, he did not become immune to the sight of death.
(93) Chewing gum - ice or use aerosol freezer to harden and scrape off.
(94) You can harden a hashed password further by adding salt (a cryptographically secure random value) to the hash.
(95) A unique cladding powder material to harden corrugating rollers surface was developed to tackle the severe dry friction abrasive wear.
(96) Stoneware is fired at a high temperature to cause it to vitrify and harden.
(97) A more likely—and alarming—scenario is that the current regime will harden its stance and tighten the screws or be replaced by an even more nationalistic and militant one.
(98) Vascular depression may result when blood vessels become less flexible and harden over time,(www.Sentencedict.com) becoming constricted.
(99) Calculus — If left alone long enough, plaque begins to mineralize and harden into calculus or tartar because the plaque absorbs calcium, phosphorus and other minerals from saliva.
(100) Sugar-coated haws is a traditional Chinese food, it is the string of wild fruit clusters with the bamboo stick dipped after the maltose thin,[sentencedict.com] taffy case of wind quickly harden.
(101) Is the volition not quite firm how Where is ability harden oneself?
(102) Especially aluminium alloy that factory develop newly Harden technology of punishing, speak highly of by user.
(103) This process involves mechanical zinc bonding to a high tensile case harden heat treated fastener, a zinc inner layer under a fusion bonded polymeric composite outer layer.
(104) Harden Gear, coated surface. Imported goods quality, local price. High price ratio.
(105) The difficulty to harden high-Carbon- Chromium contained iron is caused by the melting zone, which may bring two problems: tiny cracks and low hardness of residual austenite.
(106) Parts of hard material or with harden treatment can be de - burred and bevel angle easily.
(107) The feature of machining harden steel by means of EHM are: it can utilize the carbide tool to machine the harden steel in engine lathe.
(108) Flame hardening and induction hardening are the methods usually used to harden larger gears.
(109) Heat - treatment is used to normalize, to soften or to harden steels.
(110) Trans fatty acids ( trans fats ) are made when vegetable oil is hydrogenated to harden it.
More similar words: garden, warden, ardent, gardener, ardently, gardening, herb garden, hard-earned, garden rake, victory garden, botanical garden, landscape gardener, burden, larder, warder, unburden, guarded, bearded, boarder, disburden, retarded, overburden, burdensome, car dealer, discarded, unguarded, hard, avant-garde, avantgarde, shard.