the.com/harmful
The polite warning label slapped on anything that bites back.
means Capable of causing damage, injury, or distress to a person, thing, or system.
from From Old English 'hearm' (grief, injury, evil) plus the suffix '-ful' meaning full of — literally brimming with hurt.
Legal weightAnchors lawsuits, warning labels, and product recalls.
Quiet oppositeHarmless once meant the same, now means trivial.
Degrees matterLaw distinguishes harmful from merely annoying or offensive.