Difficult
Fluid
Fluid adjective - Involving minimal difficulty or effort.
Usage example: the dance looked smooth and fluid, though backstage we could see the dancer gasping for breath and sweating from the effort
Nearby Word: fluidity
Both words in one sentence
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It can be very difficult to get something out from being trapped in a pool of a non-Newtonian fluid.
Source: Quicksand Sucks -
Which gives her one of the most fluid styles in any fighting game and makes her difficult to read when mastered.
Source: Dance Battler - Well, lava is molten stone (it's very dense compared to a human body, which makes it difficult-to-impossible for us to sink in) in addition to being a non-Newtonian fluid.
Cite this Source
Fluid and Difficult. (2016). Retrieved 2026, August 09, from https://thesaurus.plus/related/difficult/fluid
Difficult & Fluid. N.p., 2016. Web. 09 Aug. 2026. <https://thesaurus.plus/related/difficult/fluid>.
Fluid or Difficult. 2016. Accessed August 09, 2026. https://thesaurus.plus/related/difficult/fluid.
Google Ngram Viewer shows how "difficult" and "fluid" have occurred on timeline