- adjective not able to be programmed or altered
- Resistant to scratching, denting, bending, penetration, stretching, and/or wear.
- Having high energy, such as gamma rays or X-rays.
- Having the characteristic of readily penetrating matter. Said of radiation, such as that of gamma rays or X-rays.
- That which has a permanent or fixed character to it, such as a hard drive or a hard error.
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