1Resistance or tolerance to things like heat, corrosion, pain, etc.; the ability of a person or material to withstand a stimulus.
この素材は高温に対する耐性が高い。
This material has high resistance to high temperatures.
痛みに対する耐性は人によって違う。
Tolerance to pain varies from person to person.
耐性のあるゴムは屋外で長く使える。
Durable rubber with resistance can be used outdoors for a long time.
2In medicine/biology: resistance to drugs, pesticides, etc., shown by microbes, pests, cancer cells, etc.; often refers to reduced effectiveness of treatment or control.
細菌の耐性が増し、抗生物質が効かなくなった。
Bacterial resistance increased and antibiotics became ineffective.
近年、農薬に対する害虫の耐性が問題になっている。
In recent years, pest resistance to pesticides has become a problem.