Coming out of something dangerous with no harm done. The important part is the story around it: unscathed only makes sense when something bad happened and you expected damage. The car was destroyed, but the driver walked away unscathed. You would never say "I sat at home unscathed" — there was nothing to survive. It works for bodies (nobody was hurt) and, just as often, for reputations, companies and careers: the minister emerged unscathed from the scandal; few banks came through the crisis unscathed. Notice the verbs that go with it: emerge, escape, survive, come through, walk away, get out. It nearly always sits after one of those, or after a form of be. It is not really used in front of a noun — "an unscathed man" sounds wrong; "he was unscathed" sounds right. It is somewhat formal and much more common in writing and news reports than in daily talk. A friend would say "he's fine" or "not a scratch on him." Writers often stretch it a little for effect: relatively unscathed, largely unscathed, not entirely unscathed — which quietly admit that there was some damage after all.