Wear a hat to protect your skin from harmful sunlight.
More Examples
Used in the Middle of Sentence
Factors known to encourage the growth of harmful bacteria inside cooling systems include the stagnation of the water.
The underprocessed food still contained harmful bacteria.
For soniferous otophysans, decreased auditory sensitivity is particularly harmful because it may reduce the capacity to detect acoustic signals from conspecifics.
Meaning of harmful for the defined word.
Grammatically, this word "harmful" is an adjective. It's also a morpheme, more specifically, a suffixe.