1. firmly fixed in position or condition; not easily changed or moved
Usage: often used in construction or technical contexts
2. determined or stubborn in one's opinions or ways; unwilling to change
Usage: informal

Examples

• The concrete was hardset after two days of curing.
• Once the adhesive is hardset, you cannot reposition the tiles.
• He has a hardset opinion about how things should be done.
• The hardset expression on her face showed her determination.
• The hardset rules of the organization left little room for creativity.
• After the plaster hardset, we could paint the wall.