Meaning & Definition
adjective
not causing or capable of causing harm; safe.
The snake was identified as harmless, so the children felt safe playing near it.
gentle and not likely to offend or provoke.
His joke was intended to be harmless, but it ended up upsetting a few people.
innocuous or lacking any dangerous properties.
The medicine is harmless when taken as directed.
Etymology
Middle English 'harmles', from 'harm' + '-less'
Common Phrases and Expressions
harmless prank:
a joke that is not meant to hurt anyone
harmless fun:
entertaining activities that do not cause any danger
Slang Meanings
chill
It's just a harmless hangout, nothing serious.
low stakes
That game was just a harmless competition, all in good fun.