The sculpture was a rigid steel and concrete structure.
Synonyms and exampleshardIf you hit your head on a hard surface, see a doctor.
stiffPost the picture in a stiff cardboard envelope so it doesn't get crumpled.
solidDry the clay until it's solid.
firmI prefer a firm mattress.
crispBake the cookies until they are crisp.
Antonym and examplesoftGold is a very soft metal.
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If something is hard, itdoes not bend or change shape easily.