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English definition of “smooth”

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smooth

adjective uk   /smuːð/ us  

smooth adjective (REGULAR)

B1 having a surface or consisting of a substance that is perfectly regular and has no holes, lumps, or areas that rise or fall suddenly: a smooth surface/texture/consistency This custard is deliciously smooth and creamy. Mix together the butter and sugar until smooth. The road ahead was flat and smooth. This cream will help to keep your skin smooth.
More examples

smooth adjective (NOT INTERRUPTED)

C2 happening without any sudden changes, interruption, or difficulty: We had a very smooth flight with no turbulence at all. The car's improved suspension gives a much smoother ride than earlier models. An efficient transport system is vital to the smooth running of a country's economy.

smooth adjective (TASTING PLEASANT)

having a pleasant flavour that is not sour or bitter: This coffee is incredibly smooth and rich.

smooth adjective (NOT SINCERE)

very polite, confident, and able to persuade people, but in a way that is not sincere: The foreign minister is so smooth that many of his colleagues distrust him. In job interviews, the successful candidates tend to be the smooth talkers who know exactly how to make the right impression.
smoothness
noun [U] uk   /ˈsmuːð.nəs/ us  
The wine possesses a smoothness and balanced depth that is rare. I just love the smoothness of silk.

smooth

verb uk   /smuːð/ us  

smooth verb (MAKE FLAT)

[I or T] to move your hands across something in order to make it flat: He straightened his tie nervously and smoothed (down) his hair.

smooth verb (REMOVE PROBLEMS)

[T] to remove difficulties and make something easier to do or achieve: We encourage parents to help smooth their children's way through school. We must do more to smooth the country's path to democratic reform.

smooth verb (RUB)

[T + adv/prep] to cover the surface of something with a liquid or cream, using gentle rubbing movements: Pour some oil into the palm of your hand and then smooth it over your arms and neck.
(Definition of smooth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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