Part of speech: Adjective
not causing or capable of causing harm
Example: harmless bacteria; rendered the bomb harmless
The word "harmless" comes from Proto-Germanic *harmalausaz. It started in Old English *hearmlēas. Then it appeared in Middle English harmles. Many other languages have similar words:.
harm – A related word in the same word family.
less – A related word in the same word family.
A word passing through this many languages survived because it named something universally important.