Harmful
Both words in one sentence
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And when they get aggressive, they can be actively harmful, because they're strong, agile, have powerful teeth and jaws, and even have harmful fingernails.
Source: The Red Stapler - The most powerful of these spells is harmful even to prepare and has a very good chance of rendering the caster dead and/or permanently insane (if he wasn't already).
Source: Dangerous Forbidden Technique -
Poke the Poodle: "Evil" magic spells are not very harmful and are mainly just annoying, even the ones that the most powerful evil Witches and Warlocks can cast.
Source: Videogame / The Sims 2
Cite this Source
Powerful and Harmful. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/harmful/powerful
Harmful & Powerful. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/harmful/powerful>.
Powerful or Harmful. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/harmful/powerful.
Google Ngram Viewer shows how "harmful" and "powerful" have occurred on timeline