hard ②stiff ③strong ④safe

firmness

dried ramen

Mohs' hardness

scratch hardness

Rockwell hardness

hard cover (of a book)

extremely hard

hardness and softness

hardening ②hardening (of attitude, stance, etc.) ③upturn (in the market)

sclerosis

hardness

stiffening

hardness

rigor mortis

firm

hard-liners

hard ball

hard (esp. of hardball, tennis, etc.)

hard-liners ②(young) man with traditionally masculine interests ③hard news ④strait-laced type (with respect to relationships) ⑤bullish traders

crude

tough measure

hard glass

cirrhosis

coin ②hard currency

hard-line policy

cemented carbide ②superhard

arteriosclerosis