harmless

Things that can't hurt you are harmless. It might be hard for you to believe her when your sister tells you that her enormous pet snake is completely harmless.

If your friend is scared of dogs, you can reassure her by saying, "Sure, he's 150 pounds and has a loud bark, but Fido is harmless!" Things that are safe or benign don't cause harm, and are therefore harmless, like your dad's harmless teasing or a compostable paper plate that's harmless to the environment. The word harmless originally meant "uninjured," or "not harmed," and came to mean "undamaged" by the end of the 1300s.

Definitions of harmless
1

adj not causing or capable of causing harm

harmless bacteria”
“rendered the bomb harmless
Synonyms:
benign, benignant
pleasant and beneficial in nature or influence
innocent, innocuous
lacking intent or capacity to injure
innocuous
not injurious to physical or mental health
painless
not causing physical or psychological pain
safe
free from danger or the risk of harm
atoxic, nontoxic
not producing or resulting from poison
Antonyms:
harmful
causing or capable of causing harm
disadvantageous
constituting a disadvantage
malign
evil or harmful in nature or influence
destructive
causing destruction or much damage
abusive
characterized by physical or psychological maltreatment
bad
capable of harming
bruising
causing mental or emotional injury
deleterious, hurtful, injurious
harmful to living things
calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libellous, libelous, slanderous
(used of statements) harmful and often untrue; tending to discredit or malign
catastrophic, ruinous
extremely harmful; bringing physical or financial ruin
counterproductive
tending to hinder the achievement of a goal
damaging, detrimental, prejudicial, prejudicious
(sometimes followed by `to') causing harm or injury
ill
resulting in suffering or adversity
insidious, pernicious, subtle
working or spreading in a hidden and usually injurious way
mischievous
deliberately causing harm or damage
nocent
having a tendency to cause harm
stabbing, wounding
causing physical or especially psychological injury
noxious
injurious to physical or mental health
offensive
causing anger or annoyance
painful
causing physical or psychological pain
toxic
of or relating to or caused by a toxin or poison
unwholesome
detrimental to physical or moral well-being
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