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 harmfuller for the defined word.
Grammatically, this word "harmfuller" is an adjective, more specifically, an adjective form. It's also a morpheme, more specifically, a suffixe.