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hard drug any drug, such as heroin, that is addictive and causes long-term harmful effects.
harden to make hard or more resistant to pressure. [6 definitions]
hardened past participle of harden. [4 definitions]
hardener a substance that can be added to varnish or paint in order to achieve a harder finish on the surface to which it is applied.
hard-fisted unrelentingly stingy; tight-fisted. [2 definitions]
hard goods manufactured products, such as appliances, machines, and automobiles, that last for many years; durable goods.
hard hat a protective helmet, made of metal or hard, impact-resistant plastic, worn by construction workers, miners, and the like.
hard-hat (informal) a construction worker.
hardheaded not easily moved, manipulated, or duped; shrewd; pragmatic. [2 definitions]
hardhearted without feeling or sympathy; pitiless.
hardihood strength, vigor, or determination; fortitude. [2 definitions]
hardily in a hardy manner.
hardiness the condition or quality of being hardy; strength; endurance. [2 definitions]
hard labor compulsory physical labor imposed as part of a prison sentence.
hard-line unwilling to yield, esp. in regard to ideas or ideology.
hard-liner one who is unwilling to yield, esp. in regard to ideas or ideology.
hardly almost not at all; barely; scarcely; only just. [2 definitions]
hard maple the sugar maple.
hardness the state or condition of being hard. [2 definitions]
hard-nosed tough and practical; hardheaded.
hard-on (vulgar slang) an erection of the penis.