Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Unstable and difficult are semantically related in unreliable topic. In some cases you can use "Unstable" instead an adjective "Difficult".
Nearby Word: difficulty
Unstable
Unstable adjective - Not being in or able to maintain a state of balance.
Difficult and unstable are semantically related in unreliable topic. Sometimes you can use "Difficult" instead an adjective "Unstable".
Nearby Word: unstably
Both words in one sentence
- He fails, and makes things more difficult for Tommy, who is already having a difficult enough time trying to maintain the unstable drug lord's trust.
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On community-made race maps, players have to handle both their heat (doubly so if it's weapons-live racing) and stay on the track; not too difficult on most tanks, very difficult on the Hover Tanks which have heat-free boost, but are highly unstable and prone to flipping and sliding off the track.
Source: Over Drive - His first attempts, the Thunder Warriors and the Custodes, were powerful but were also physically and mentally unstable and too difficult to mass produce respectively.
Cite this Source
Unstable and Difficult. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/difficult/unstable
Difficult & Unstable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/difficult/unstable>.
Unstable or Difficult. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/difficult/unstable.
Google Ngram Viewer shows how "difficult" and "unstable" have occurred on timeline