[adjective]Harmless means not able or not likely to cause harm.Ozone is fairly harmless to people, but it hurts plants.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.
HARMLESS
Meaning of HARMLESS in English
Cambridge English vocab. Кембриджский английский словарь. 2012