Despite the heat, the unmelted ice sculptures stood intact in the courtyard.

The scientist admired the alloy's unmeltability during the extreme heat tests.

The artist used an unmeltable resin to create outdoor sculptures that withstand summer heat.

The scientists extracted an unmelting shard from the volcanic rock and could not make it soften in the lab.

Under the old alchemist's touch, the melted silver unmelts into a bright, solid ingot.

When the temperature dropped suddenly, the roadside slush started to unmelt into brittle ice.

The researcher was impressed by the unmeltableness of the new polymer under extreme heat.

The ancient alloy remained unmeltably bonded to the artifact, defying every furnace we tried.