handful. injurious. detrimental. or undesirable.

Merriam-Webster Online Dictionary
noxious (adjective)
1.
a) physically harmful or destructive to living beings - noxious waste
b) constituting a harmful influence on mind or behavior , especially morally corrupting - noxious doctrines
2.
- disagreeable obnoxious pernicious
noxious (Wikipedia)

Noxious describes any happening that is perceived as harmful. It may also refer to:

  • Poison, substances that can harm or kill
  • Noxious weed, a plant designated by the government as injurious to public health, agriculture, recreation, wildlife or property
  • Noxious stimulus, an actually or potentially tissue damaging event, may be mechanical, chemical or thermal
  • Federal Noxious Weed Act of 1974, a United States law that established a federal program to control the spread of noxious weeds
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