Harmful vs Ruining - What's the difference?
As an adjective harmful
is of a kind likely to be damaging; injurious.
As a verb ruining is
* harmfull (archaic)
of a kind likely to be damaging; injurious
- Wear a hat to protect your skin from harmful sunlight.
* Nouns to which "harmful" is often applied: effect, consequence, impact, influence, emission, chemical, ingredient, substance, gas, agent, additive, drug, radiation, dust, organism, plant, animal, insect, action, act, behavior, component, content, activity, interference, use.
* injurious; see also