Harmful
Toxic
Toxic adjective - Containing or contaminated with a substance capable of injuring or killing a living thing.
Usage example: certain plants are toxic if eaten
Harmful is a synonym for toxic in poisonous topic. You can use "Harmful" instead the word "Toxic" as an adjective or a noun. popular alternative
Mutual synonyms
Both words in one sentence
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One variation of this trope is that the character's mental deficiencies are not from a head injury but by them ingesting something harmful and toxic such as paint chips or alcohol.
Source: Childhood Brain Damage -
It is almost always harmful to the local habitat, whether directly (such as giving off toxic gases) or simply by outcompeting and choking out the local vegetation.
Source: Alien Kudzu - A character with low luck gets to experience a variety of harmful random encounters in the world map such as Pariah dogs, toxic waste dumps, and general nastiness.
Source: Luck Stat
Cite this Source
Toxic and Harmful. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/harmful/toxic
Harmful & Toxic. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/harmful/toxic>.
Toxic or Harmful. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/harmful/toxic.
Google Ngram Viewer shows how "harmful" and "toxic" have occurred on timeline