Able not to be affected by something.
A lack of response to, or of influence by, a pathogen, toxin, treatment, or other stressor.
Hair type that is difficult for moisture or chemicals to penetrate, and thus requires a longer processing time.
The presence of attributes that impede the progression of a specific pathogenic organism (BMS) is under scrutiny. Similar assessments are relevant for the usage of this terminology, as with the concept of resistance.