Harmless and Pernicious

Opposite meaning words

Harmless adjective - Not causing or being capable of causing injury or hurt.

Usage example: a perfectly harmless little spider

Show all Definitions

Pernicious is an antonym for harmless.

Nearby Words: harm, harmful, harmlessly

Pernicious adjective - Causing or capable of causing harm.

Usage example: the pernicious effects of illegal narcotics on society

Show all Definitions

Harmless is an antonym for pernicious in bad topic.

Nearby Word: perniciously

Cite this Source

Pernicious and Harmless. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/harmless/pernicious

Harmless & Pernicious. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/harmless/pernicious>.

Pernicious or Harmless. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/harmless/pernicious.

Google Ngram Viewer shows how "harmless" and "pernicious" have occurred on timeline