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"harmless" is also used as a crossword clue. If that's what you saw, the answer is often innocuous (9 letters).
Definitions
not causing or capable of causing harm
Word origin
From Middle English harmles, from Old English *hearmlēas, from Proto-Germanic *harmalausaz (“without harm; harmless”), equivalent to harm + -less.
Used in a sentence
“Near-synonyms: benign, innocuous, innocent, undamaging, nonthreatening, unthreatening”
“This snake looks nearly the same as its poisonous cousin but is harmless.”
“His humor can be annoying but is harmless.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Not dangerous”8 letters
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