強硬【きょうこう】
firm, strong, unbending, unyielding, uncompromising, stubborn, tough, hard-line
硬貨【こうか】
coin, hard currency
肝硬変【かんこうへん】
cirrhosis (of the liver)
硬さ【かたさ】
firmness, hardness, stiffness, honesty
硬化【こうか】
hardening, vulcanization, vulcanisation, sclerosis, curing, hardening (of attitude, stance, etc.), stiffening, toughening, upturn (in the market), firming up
硬い【かたい】
hard, solid, tough, stiff, tight, wooden, unpolished (e.g. writing), strong, firm (not viscous or easily moved), safe, steady, honest, steadfast, obstinate, stubborn, bookish, formal, stuffy
硬度【こうど】
hardness, solidity
硬質【こうしつ】
hardness, stiffness