Cheryl Strayed memoir subtitled "From Lost to Found on the Pacific Crest Trail" (4)

I believe the answer is:

wild

(Other definitions for wild that I've seen before include "Feral, untamed" , "Feral - crazy" , "Undomesticated" , "Tempestuous" , "Savage" .)

I've seen this clue in The New York Times.

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