Definition Of harmful
causing or likely to cause harm.
shield the planet from harmful cosmic rays
Example Of harmful
A form that has a soothing, healing effect is the result of a mind that is free from harmfulness and defects.
Although in a modern Western diet salt is plentiful - sometimes harmfully superfluous - its normal concentration in the body fluids is essential to the maintenance of a normal blood volume.
Are the more sexual representations merely offensive, or can they be genuinely harmful ?
Brian looked like the romantic, idealistic and harmfully quixotic sort.
CFC gas damages the ozone layer which protects the earth from harmful rays from the sun.