People OR things can be harmed or physically damaged:
The bank robbers were anxious not to harm anyone.
Without doubt,the burning of fossil fuels harms the environment in which we live
We have a number of expressions with the noun harm which are confusingly similar: will come to no harm, it will do no harm to…, there's no harm in…, no harm done:
Will my dog be all right with you? ~ He'll be fine. He'll come to no harm in my garden.
It will do / can do no harm to remind him to take the medication before he goes to bed.
She might not agree, but there's no harm in asking her to postpone the meeting.
I'm sorry to crash into you like that! Are you all right? ~ I'm fine. No harm done!
harmful / harmless (adjs)
Harmful and harmless describe something that has or does not have a bad effect on something else:
He looks quite ferocious and barks quite loudly, but he's
The harmful effects of smoking on people's health is