The word for today is…
deleterious (adjective):
harmful often in a subtle or unexpected way
Source : Merriam -Webster
Etymology :When you hold down the delete key on your keyboard or touchscreen, the effect is instantaneous. Deleterious effects, however, are often not so obvious; deleterious is used to describe things that are harmful in ways that are unexpected, slow-acting, or not readily apparent. Although most often used in formal speech and writing, deleterious is far from rare.
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