Roget's Thesaurus: Entry 323 (Hardness)

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#323. Hardness. -- N. hardness &c. adj.; rigidity; renitence[obs], renitency; inflexibility, temper, callosity, durity [obs].

induration, petrifaction; lapidification[obs], lapidescence[obs]; vitrification, ossification; crystallization.

stone, pebble, flint, marble, rock, fossil, crag, crystal, quartz, granite, adamant; bone, cartilage; hardware; heart of oak, block, board, deal board; iron, steel; cast iron, decarbonized iron, wrought iron; nail; brick, concrete; cement.

V. render hard &c. adj.; harden, stiffen, indurate, petrify, temper, ossify, vitrify; accrust[obs].

Adj. hard, rigid, stubborn, stiff, firm; starch, starched; stark, unbending, unlimber, unyielding; inflexible, tense; indurate, indurated; gritty, proof.

adamant, adamantine, adamantean[obs]; concrete, stony, granitic, calculous, lithic[obs], vitreous; horny, corneous[obs]; bony; osseous, ossific[obs]; cartilaginous; hard as a rock &c. n.; stiff as buckram, stiff as a poker; stiff as starch, stiff as as board.