Resistant is an adjective that describes the ability to withstand or oppose something.
Common usages include:
1. Water-resistant - able to resist water penetration to some degree
2. Drug-resistant - referring to bacteria or viruses that are not affected by drugs
3. Heat-resistant - able to withstand high temperatures
4. Corrosion-resistant - not easily corroded or rusted
5. Resistant to change - unwilling to accept new ideas or methods