1. not capable of being hammered, pressed, or rolled into thin sheets without breaking; not malleable
Usage: technical; materials science
2. not easily influenced, changed, or adapted; inflexible
Usage: figurative

Examples

• Cast iron is nonmalleable and will crack if hammered.
• The ceramic material proved to be completely nonmalleable under pressure.
• His nonmalleable personality made it difficult to negotiate with him.
• The committee’s nonmalleable stance on the issue frustrated many members.
• Unlike gold, which is highly malleable, this alloy is nonmalleable and brittle.
• Her nonmalleable opinions rarely changed despite new evidence.