Not hurt or damaged; safe and in good condition.
From 'un-' (not) + 'harmed' (past participle of 'harm'). 'Harm' comes from Old English 'heorm' meaning grief or damage.
The prefix 'un-' is one of the most productive in English—you can attach it to almost any adjective to create an antonym, and it's been doing this since Old English times.
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