Against
Against preposition - In or into contact with.
Harmful to and against are semantically related. in disadvantageous to topic. In some cases you can use "Harmful to" instead a preposition "Against", when it comes to topics like unfavourable to.
Harmful to
Against and harmful to are semantically related. Sometimes you can replace term "Against" with "Harmful to", this terms are similar.
Both terms in one sentence
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Harmful to Touch - Chemical weaponry is in heavy use, especially against monsters.
- Also Reach revealed that things of Slender Man's sphere of influence, such as wood, are harmful to him when defiled and turned against him i.e.
Source: Blog / What You Are in the Dark -
Chemistry is also seen as the science that is most harmful to the environment, and this coupled with some chemical disasters and the technobabble spouted by chemists has given rise to chemophobia, an irrational prejudice against "artificial" chemicals.
Source: Acceptable Professional Targets
Cite this Source
Harmful to and Against. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/against/harmful_to
Against & Harmful to. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/against/harmful_to>.
Harmful to or Against. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/against/harmful_to.
Google Ngram Viewer shows how "against" and "harmful to" have occurred on timeline