Definition of “harmless” - English Dictionary

“harmless” in British English

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harmlessadjective

uk /ˈhɑːm.ləs/ us /ˈhɑːrm.ləs/

B2 not able or not likely to cause harm:

Peter might look a bit fierce, but actually he's fairly harmless.
There were those who found the joke offensive, but Johnson insisted it was just a bit of harmless fun.

More examples

harmlessly
adverb uk /ˈhɑːm.ləs.li/ us /ˈhɑːrm.ləs.li/
harmlessness
noun [ U ] uk /ˈhɑːm.ləs.nəs/ us /ˈhɑːrm.ləs.nəs/

(Definition of “harmless” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“harmless” in American English

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harmlessadjective

us /ˈhɑrm·ləs/

not able or likely to cause harm:

(Definition of “harmless” from the Cambridge Academic Content Dictionary © Cambridge University Press)