Acid
Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Acid and difficult are semantically related. Sometimes you can use "Acid" instead an adjective "Difficult".
Nearby Word: difficulty
Mutual synonyms
Both words in one sentence
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In the manga, she's able to continue fighting against one of the more difficult opponents even after her legs get burned off by acid.
Source: Manga / Bokurano -
Besides being agile and difficult to spot, these also spat acid.
Source: Airborne Mook - It's straight humor and difficult to imagine it wasn't written on acid.
Source: Fanfic Recs / Transformers
Cite this Source
Difficult and Acid. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/acid/difficult
Acid & Difficult. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/acid/difficult>.
Difficult or Acid. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/acid/difficult.
Google Ngram Viewer shows how "acid" and "difficult" have occurred on timeline