- causing or capable of causing harm; injurious: a harmful idea; a harmful habit.
Origin of harmful
SynonymsSee more synonyms for harmful on Thesaurus.com
hurtful, detrimental, damaging, deleterious.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for harmfulness
In the Middle Ages they thought to reduce its harmfulness at least by direct elimination, hence the use of drastic purgatives.Medieval Medicine
James J. (James Joseph) Walsh
Quite possible, the experience, made at an early day with the breeding of animals, revealed the harmfulness of in-breeding.
The immorality and harmfulness of this system are obvious, and they spread with the extension of capitalism.
Many persons call almost every creature an insect that is small and supposed to be useless, or suspected of harmfulness.Zoology: The Science of Animal Life
They went from shop to shop, making the shopkeepers see the harmfulness of the Moncadist politics, promising them advantages.Csar or Nothing
Po Baroja Baroja
- causing or tending to cause harm; injurious
Word Origin and History for harmfulness
Online Etymology Dictionary, © 2010 Douglas Harper