Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Usage example: difficult questions on the exam that required analytical thinking
Nearby Word: difficulty
Smooth
Smooth adjective - Involving minimal difficulty or effort.
Usage example: it should be smooth going from this point on
Both words in one sentence
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The filmmakers note in the DVD commentary how difficult it was building a camera rig that would give a smooth transition from descending from the ceiling into the Congress chamber.
Source: Theatre / 1776 -
In these situations, moving over anything but smooth floors was difficult for the actress, so having her stumble, stagger, and trip over outdoor terrain made sense.
Source: Broken Heel -
The relatively slow speed of strikes is a big part of what makes the game difficult, as is the fact that blocking isn't always safe and you can run out of strength, but eventually it gets pretty smooth for the player.
Source: Some Dexterity Required
Cite this Source
Smooth and Difficult. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/difficult/smooth
Difficult & Smooth. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/difficult/smooth>.
Smooth or Difficult. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/difficult/smooth.
Google Ngram Viewer shows how "difficult" and "smooth" have occurred on timeline