The word for today is…

impervious (adj) – 1. Incapable of being penetrated.
2. Incapable of being affected.

Source : The Free Dictionary

Etymology : The English language is far from impervious, and, of course, a great many Latinate terms have entered it throughout its history. Impervious is one of the many that broke through in the 17th century. It comes from the Latin impervius, which adds the prefix im- to pervius, meaning “passable” or “penetrable.” Pervius—which is also the source of the relatively uncommon English word pervious, meaning “accessible” or “permeable”—comes from per-, meaning “through,” and via, meaning “way.”

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Peter is a fourth-generation New Zealander, with his mother's and father's folks having arrived in New Zealand in the 1870s. He lives in Lower Hutt with his wife, some cats and assorted computers. His...