Not easily bent or flexible; rigid or firm.

Aching or difficult to move after exertion or rest.

Formal, unrelaxed, or lacking ease in manner.

Harsh, severe, or hard to deal with.

Strong or potent, especially of an alcoholic drink.

High in price; costly.

Thick or dense in consistency; hard to stir.

• In baking, beaten until peaks stand up on their own.

A dead body; a cadaver.

• Informal.

A customer who leaves no tip.

• Informal.

To cheat or fail to pay; leave without paying.

• Informal.

Of wind, blowing strongly.

Mathematics: a differential equation hard to solve numerically unless step size is very small.

• Specialized.