Harmless
Harmless adjective - Not causing or being capable of causing injury or hurt.
Usage example: a perfectly harmless little spider
Mischievous is an antonym for harmless.
Mischievous
Mischievous adjective - Causing or capable of causing harm.
Usage example: mischievous gossip that ruined a good woman's reputation
Harmless is an antonym for mischievous.
Both words in one sentence
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Cheshire Cat Grin: Despite being regarded as the Trope Namer, the Cat is mostly harmless; he's a mischievous creature, but not malicious to Alice or anyone who doesn't seem to deserve it.
- In the Ben 10: Alien Force episode "Fool's Gold", mischievous but harmless aliens come to a village every 17 years where they eat massive quantities of popcorn and defecate solid gold.
Source: Once-Green Mars -
Rule of Cool Sacrificial Planet: In the episode "Fool's Gold", mischievous but harmless aliens come to a village every 17 years where they eat massive quantities of popcorn and defecate solid gold.
Cite this Source
Mischievous and Harmless. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/harmless/mischievous
Harmless & Mischievous. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/harmless/mischievous>.
Mischievous or Harmless. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/harmless/mischievous.
Google Ngram Viewer shows how "harmless" and "mischievous" have occurred on timeline