Something sinuous has curves that go back and forth.
Or, it's so complicated that it seems to curve back and forth.
(Very rarely, "sinuous" means "crooked in an immoral way." We won't focus on that meaning in this issue.)
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Part of speech:
(Adjectives are describing words, like "large" or "late."
They can be used in two ways:
1. Right before a noun, as in "a sinuous thing."
2. After a linking verb, as in "It was sinuous.")
Other common forms: sinuously, sinuosity (or "sinuousness")
How to use it:
The tone of this word is often positive. Sinuous things are often graceful and often found in nature.
To be literal, talk about sinuous roads, rivers, coastlines, etc.
Or, talk about sinuous bends, folds, curves, shapes, outlines, features, courses, motions, and movements.
You might be figurative and talk about a sinuous career path, the sinuous plot of a movie, a philosopher's sinuous argument, and so on.
When you use the noun, "sinuosity," you can make it both countable ("the plot's many sinuosities") and uncountable ("the plot's sinuosity").
examples: He gets to the point, but sinuously, winding his way through anecdotes.