Lunatic
Lunatic adjective - Having or showing a very abnormal or sick state of mind.
Usage example: he had a lunatic obsession with personal hygiene that was genuinely disturbing
Loopy is a synonym for lunatic in ability topic. In some cases you can use "Loopy" instead an adjective "Lunatic", when it comes to topics like mad.
Mutual synonyms
Cite this Source
Loopy and Lunatic. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/lunatic/loopy
Lunatic & Loopy. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/lunatic/loopy>.
Loopy or Lunatic. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/lunatic/loopy.
Google Ngram Viewer shows how "lunatic" and "loopy" have occurred on timeline