Hydra
Hydra noun - Trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality.
Usage example: we may be facing a hydra that defies any easy solution
Problem and hydra are semantically related. in annoyance topic. In some cases you can use "Problem" instead a noun "Hydra".
Nearby Word: hydrate
Problem
Problem noun - Something that requires thought and skill for resolution.
Nearby Words: problematic, problematical
Both words in one sentence
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There's also a classic math problem involving hydra herds in which every blow which fails to kill a hydra spawns a number of duplicates of the damaged hydra equal to the number of blows which the entire herd has received.
Source: Hydra Problem -
In Percy Jackson and the Olympians, they fight a literal Hydra (who has this problem).
Source: Hydra Problem -
The problem, though, is that hydraulics work by moving liquid through pipes (hence the "hydra" part of the word).
Source: Franchise / Terminator
Cite this Source
Problem and Hydra. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/hydra/problem
Hydra & Problem. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/hydra/problem>.
Problem or Hydra. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/hydra/problem.
Google Ngram Viewer shows how "hydra" and "problem" have occurred on timeline